Solved: VOICE GATEWAY TROUBLESHOOTING

ugwuugochukwuk · ‎02-02-2022

Hello All, One of my customers recently reported their inability to make outbound calls. The ISP has been contacted, and they have been insisting there's a loopback on the router, but I have logged on to the router and there is no loopback.

Also when i change the isdn switch type to primary net 5, If I reload the router it goes back to primary 4ess

I did a debug

 voip ccapi inout

and this is the output below:

SRST-HQ#
SRST-HQ#debug voip ccapi inout
voip ccapi inout debugging is on
SRST-HQ#

SRST-HQ#terminal mon
SRST-HQ#terminal monitor
SRST-HQ#
SRST-HQ#
SRST-HQ#
SRST-HQ#
SRST-HQ#
SRST-HQ#
SRST-HQ#
Jan 27 13:47:26.933: //-1/80F016A84A02/CCAPI/cc_api_display_ie_subfields:
cc_api_call_setup_ind_common:
cisco-username=IT Service Desk Analyst
----- ccCallInfo IE subfields -----
cisco-ani=1951
cisco-anitype=0
cisco-aniplan=0
cisco-anipi=0
cisco-anisi=1
dest=08064696430
cisco-desttype=0
cisco-destplan=0
cisco-rdie=FFFFFFFF
cisco-rdn=
cisco-rdntype=-1
cisco-rdnplan=-1
cisco-rdnpi=-1
cisco-rdnsi=-1
cisco-redirectreason=-1 fwd_final_type =0
final_redirectNumber =
hunt_group_timeout =0

Jan 27 13:47:26.937: //-1/80F016A84A02/CCAPI/cc_api_call_setup_ind_common:
Interface=0x2335DC0, Call Info(
Calling Number=1951,(Calling Name=)(TON=Unknown, NPI=Unknown, Screening=User, Passed, Presentation=Allowed),
Called Number=08064696430(TON=Unknown, NPI=Unknown),
Calling Translated=FALSE, Subscriber Type Str=Unknown, FinalDestinationFlag=TRUE,
Incoming Dial-peer=0, Progress Indication=NULL(0), Calling IE Present=TRUE,
Source Trkgrp Route Label=, Target Trkgrp Route Label=, CLID Transparent=FALSE), Call Id=127
Jan 27 13:47:26.937: //-1/xxxxxxxxxxxx/CCAPI/cc_get_feature_vsa:

Jan 27 13:47:26.937: :cc_get_feature_vsa malloc success
Jan 27 13:47:26.937: //-1/xxxxxxxxxxxx/CCAPI/cc_get_feature_vsa:

Jan 27 13:47:26.937: cc_get_feature_vsa count is 1
Jan 27 13:47:26.937: //-1/xxxxxxxxxxxx/CCAPI/cc_get_feature_vsa:

Jan 27 13:47:26.937: :FEATURE_VSA attributes are: feature_name:0,feature_time:328972288,feature_id:127
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/cc_api_call_setup_ind_common:
Set Up Event Sent;
Call Info(Calling Number=1951(TON=Unknown, NPI=Unknown, Screening=User, Passed, Presentation=Allowed),
Called Number=08064696430(TON=Unknown, NPI=Unknown))
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/cc_process_call_setup_ind:
Event=0x26DF470
Jan 27 13:47:26.937: //-1/xxxxxxxxxxxx/CCAPI/cc_setupind_match_search:
Try with the demoted called number 08064696430
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/ccCallSetContext:
Context=0x312A2DC
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/cc_process_call_setup_ind:
>>>>CCAPI handed cid 127 with tag 0 to app "_ManagedAppProcess_TOLLFRAUD_APP"
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/ccCallDisconnect:
Cause Value=21, Tag=0x0, Call Entry(Previous Disconnect Cause=0, Disconnect Cause=0)
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/ccCallDisconnect:
Cause Value=21, Call Entry(Responsed=TRUE, Cause Value=21)
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/cc_api_get_transfer_info:
Transfer Number=NULL
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/cc_api_call_disconnect_done:
Disposition=0, Interface=0x2335DC0, Tag=0x0, Call Id=127,
Call Entry(Disconnect Cause=21, Voice Class Cause Code=0, Retry Count=0)
Jan 27 13:47:26.937: //127/80F016A84A02/CCAPI/cc_api_call_disconnect_done:
Call Disconnect Event Sent
Jan 27 13:47:26.937: //-1/xxxxxxxxxxxx/CCAPI/cc_free_feature_vsa:

Jan 27 13:47:26.937: :cc_free_feature_vsa freeing 139BB7F8
Jan 27 13:47:26.937: //-1/xxxxxxxxxxxx/CCAPI/cc_free_feature_vsa:

Jan 27 13:47:26.937: vsacount in free is 0
Jan 27 13:47:52.469: //-1/803996B74B02/CCAPI/cc_api_display_ie_subfields:
cc_api_call_setup_ind_common:
cisco-username=IT Service Desk Analyst
----- ccCallInfo IE subfields -----
cisco-ani=1951
cisco-anitype=0
cisco-aniplan=0
cisco-anipi=0
cisco-anisi=1
dest=08090407097
cisco-desttype=0
cisco-destplan=0
cisco-rdie=FFFFFFFF
cisco-rdn=
cisco-rdntype=-1
cisco-rdnplan=-1
cisco-rdnpi=-1
cisco-rdnsi=-1
cisco-redirectreason=-1 fwd_final_type =0
final_redirectNumber =
hunt_group_timeout =0

Jan 27 13:47:52.469: //-1/803996B74B02/CCAPI/cc_api_call_setup_ind_common:
Interface=0x2335DC0, Call Info(
Calling Number=1951,(Calling Name=)(TON=Unknown, NPI=Unknown, Screening=User, Passed, Presentation=Allowed),
Called Number=08090407097(TON=Unknown, NPI=Unknown),
Calling Translated=FALSE, Subscriber Type Str=Unknown, FinalDestinationFlag=TRUE,
Incoming Dial-peer=0, Progress Indication=NULL(0), Calling IE Present=TRUE,
Source Trkgrp Route Label=, Target Trkgrp Route Label=, CLID Transparent=FALSE), Call Id=128
Jan 27 13:47:52.469: //-1/xxxxxxxxxxxx/CCAPI/cc_get_feature_vsa:

Jan 27 13:47:52.469: :cc_get_feature_vsa malloc success
Jan 27 13:47:52.469: //-1/xxxxxxxxxxxx/CCAPI/cc_get_feature_vsa:

Jan 27 13:47:52.469: cc_get_feature_vsa count is 1
Jan 27 13:47:52.469: //-1/xxxxxxxxxxxx/CCAPI/cc_get_feature_vsa:

Jan 27 13:47:52.469: :FEATURE_VSA attributes are: feature_name:0,feature_time:328972288,feature_id:128
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/cc_api_call_setup_ind_common:
Set Up Event Sent;
Call Info(Calling Number=1951(TON=Unknown, NPI=Unknown, Screening=User, Passed, Presentation=Allowed),
Called Number=08090407097(TON=Unknown, NPI=Unknown))
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/cc_process_call_setup_ind:
Event=0x26DF470
Jan 27 13:47:52.469: //-1/xxxxxxxxxxxx/CCAPI/cc_setupind_match_search:
Try with the demoted called number 08090407097
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/ccCallSetContext:
Context=0x312B884
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/cc_process_call_setup_ind:
>>>>CCAPI handed cid 128 with tag 0 to app "_ManagedAppProcess_TOLLFRAUD_APP"
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/ccCallDisconnect:
Cause Value=21, Tag=0x0, Call Entry(Previous Disconnect Cause=0, Disconnect Cause=0)
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/ccCallDisconnect:
Cause Value=21, Call Entry(Responsed=TRUE, Cause Value=21)
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/cc_api_get_transfer_info:
Transfer Number=NULL
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/cc_api_call_disconnect_done:
Disposition=0, Interface=0x2335DC0, Tag=0x0, Call Id=128,
Call Entry(Disconnect Cause=21, Voice Class Cause Code=0, Retry Count=0)
Jan 27 13:47:52.469: //128/803996B74B02/CCAPI/cc_api_call_disconnect_done:
Call Disconnect Event Sent
Jan 27 13:47:52.469: //-1/xxxxxxxxxxxx/CCAPI/cc_free_feature_vsa:

Jan 27 13:47:52.469: :cc_free_feature_vsa freeing 139BB7F8
Jan 27 13:47:52.469: //-1/xxxxxxxxxxxx/CCAPI/cc_free_feature_vsa:

Jan 27 13:47:52.469: vsacount in free is 0
SRST-HQ#
SRST-HQ#
SRST-HQ#
SRST-HQ#
SRST-HQ#
SRST-HQ#
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!




The output above shows that the call actually gets to the voice gateway but it doesn't get to the called line. Please assist!!!!!!!!!!!!




Also below is the show controller e1 output




SRST-HQ#
SRST-HQ#sh contr
SRST-HQ#sh controller e1
E1 0/0/0 is up.
Applique type is Channelized E1 - balanced
Description: 21century E1
No alarms detected.
alarm-trigger is not set
Version info FPGA Rev: 08121917, FPGA Type: PRK4
Framing is CRC4, Line Code is HDB3, Clock Source is Line.
International Bit: 1, National Bits: 11111
Data in current interval (358 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
22767 Line Code Violations, 246 Path Code Violations,
1 Slip Secs, 8 Fr Loss Secs, 16 Line Err Secs, 0 Degraded Mins,
24 Errored Secs, 19 Bursty Err Secs, 4 Severely Err Secs, 139 Unavail Secs

Also when i change the isdn switch type to primary net 5, If I reload the router it goes back to primary 4ess

@Leo Laohoo could you help with this

@Chris Deren sir please kindly assist

Elliot Dierksen · ‎02-07-2022

This is configured as an MGCP gateway. It isn't part of the outbound path based on the DNA output you posted. It will only register with a single CUCM node which is 10.196.8.7. The secondary CUCM is listed as

mmosnigotcsub.ng1.heiway.net

but that won't work unless 145.47.188.73 can resolve that name. It doesn't appear that it can because "First Backup None" in the

show ccm-manager

output. It looks like there are multiple things wrong. The MGCP gateway isn't part of a route group that is in the route list for the outgoing call and the MGCP gateway only registers with a single CUCM node. Perhaps the CM group in the gateway config only has a single CUCM node in it. I have no idea how it got that way, but those are the obvious problems I see in the information you have given.

View solution in original post

Scott Leport · ‎02-02-2022

Hi,

You would be better off posting in the collaboration forums, however your issue is clear:

app "_ManagedAppProcess_TOLLFRAUD_APP




Call Entry(Disconnect Cause=21, Voice Class Cause Code=0, Retry Count=0)
Jan 27 13:47:52.469:

Check the following on your voice gateway:

1. Your dial peers contains the IP address you’re trying to reach is configured as a session target.

2. Add the IP address your trying to send calls to your trusted IPV4 list.

ugwuugochukwuk · ‎02-03-2022

How do I check for this ?

ugwuugochukwuk · ‎02-04-2022

Hello Scott, I skipped this earlier.... I have added ip address to trusted ipv4 list and it still didn't go through

What do you mean when you said the issue I had was clear with the error below ::

app "_ManagedAppProcess_TOLLFRAUD_APP




Call Entry(Disconnect Cause=21, Voice Class Cause Code=0, Retry Count=0)
Jan 27 13:47:52.469:

What do you think is the cause of the error above ?

Thanks in anticipation .

Georg Pauwen · ‎02-02-2022

Hello,

--> 22767 Line Code Violations, 246 Path Code Violations

The first thing I would do is check with your ISP, as these errors usually indicate some sort of physical problem.

ugwuugochukwuk · ‎02-03-2022

ISP has checked and said they're seeing loopbacks pointing to the router but I checked router config and no loopbacks

Georg Pauwen · ‎02-03-2022

Hello,

--> loopbacks pointing to the router

I am curious to find out what they mean by that. They usually can test if the circuit is clean up to their equipment.

Can you post the running config of your device ?

ugwuugochukwuk · ‎02-03-2022

Hello Georg, this is the running config below

SRST-HQ#
SRST-HQ#sh run
Building configuration...


Current configuration : 9223 bytes
!
! Last configuration change at 17:30:37 WAT Thu Feb 3 2022 by Superadmin
! NVRAM config last updated at 17:37:40 WAT Thu Feb 3 2022 by Superadmin
!
version 15.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname SRST-HQ
!
boot-start-marker
boot-end-marker
!
!
card type e1 0 0
card type e1 0 1
no logging buffered
no logging console
enable password 7 011D045008031703204B411A
!
aaa new-model
!
!
aaa authentication login AAA group tacacs+ local
aaa authorization exec AAA group tacacs+ local
aaa authorization commands 15 AAA group tacacs+ local
aaa accounting commands 15 AAA start-stop group tacacs+
!
!
!
!
!
aaa session-id common
clock timezone WAT 1 0
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-select 1 E1 0/0/0
!
!
!
!
!
!
!
!
!
!
!
ip dhcp excluded-address 10.10.10.1
!
!
!
no ip domain lookup
ip domain name nig.mmo.heiway.net
ip host patiencehenr-pc 145.47.188.29
ip name-server 145.47.188.73
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!
!
!
!
!
isdn switch-type primary-4ess
!
cts logging verbose
!
crypto pki trustpoint TP-self-signed-3889551682
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-3889551682
revocation-check none
rsakeypair TP-self-signed-3889551682
!
!
crypto pki certificate chain TP-self-signed-3889551682
certificate self-signed 01
3082022B 30820194 A0030201 02020101 300D0609 2A864886 F70D0101 05050030
31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274
69666963 6174652D 33383839 35353136 3832301E 170D3135 31303033 30313139
30385A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649
4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D33 38383935
35313638 3230819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281
8100CF92 2545E8A0 C6CFC5F2 11CEE00A D8FD76CF B37A1A89 A5E996A9 529D2C50
EC51C451 BBABFF02 CA8F74A5 CB90CFA1 5C2B9D3E 1BD1E47F F35635AF 06DFEB2F
E24267DE DDA16D15 9CDA2B12 B33DDD2D FC5FD32B 3FA1833B 44E3C181 C331AA8B
3E1A0E5B 1F15CCE9 1C6E2FCE 79157B38 08E4B9B3 901E284E A2E644E5 D7481138
E19F0203 010001A3 53305130 0F060355 1D130101 FF040530 030101FF 301F0603
551D2304 18301680 14457EA7 D4631035 29AAF1FD 8C1AE2EA 82FA9B51 92301D06
03551D0E 04160414 457EA7D4 63103529 AAF1FD8C 1AE2EA82 FA9B5192 300D0609
2A864886 F70D0101 05050003 8181002F 57641478 197A2A1A 130C3D81 CD711575
23E14F3A 56AA28CA 2DA3A5B3 EAA998C3 B9589E2B 13865640 2E4A5478 5323A2CF
A06C4E02 144570BC 49469EF8 255D1999 01BFA7E9 F4A901EB A86B4B70 C523F0F2
00595298 895A1319 123BB071 92BA5EBA C911893C 05B405FB 4286788F F11BE366
086B33F0 321656A3 3F873C4D DD092C
quit
voice-card 0
dspfarm
dsp services dspfarm
!
!
voice rtp send-recv
!
voice service voip
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
supplementary-service media-renegotiate
redirect ip2ip
fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
h323
sip
!
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g711alaw
codec preference 3 g729r8
!
!
!
!
!
!
!
!
license udi pid C3900-SPE150/K9 sn FOC1927CESV
hw-module pvdm 0/0
!
hw-module pvdm 0/1
!
!
!
redundancy
!
!
controller E1 0/0/0
pri-group timeslots 1-31 service mgcp
description 21century E1
!
controller E1 0/1/0
!
controller E1 0/1/1
!
ip ssh version 2
ip ssh server algorithm mac hmac-sha1
ip ssh server algorithm encryption aes256-ctr
!
class-map match-any AutoQoS-VoIP-Remark
match ip dscp ef
match ip dscp cs3
match ip dscp af31
match ip dscp default
class-map match-any AutoQoS-VoIP-RTP-Trust
match ip dscp ef
class-map match-any AutoQoS-VoIP-Control-Trust
match ip dscp cs3
match ip dscp af31
!
policy-map AutoQoS-Policy-Trust
class AutoQoS-VoIP-RTP-Trust
priority percent 70
class AutoQoS-VoIP-Control-Trust
bandwidth percent 5
class class-default
fair-queue
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
description voice int
ip address 145.47.188.43 255.255.255.0
duplex auto
speed auto
ip rsvp bandwidth
!
interface GigabitEthernet0/0.1
encapsulation dot1Q 100
ip address 10.196.7.5 255.255.255.0
ip rsvp bandwidth
!
interface GigabitEthernet0/0.5
encapsulation dot1Q 50
ip address 10.196.8.5 255.255.255.0
ip rsvp bandwidth
!
interface GigabitEthernet0/0.6
encapsulation dot1Q 60
ip address 10.196.3.5 255.255.255.0
!
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn overlap-receiving
isdn incoming-voice voice
isdn bind-l3 ccm-manager
isdn bchan-number-order ascending
isdn PROGRESS-instead-of-ALERTING
no cdp enable
!
ip default-gateway 192.168.8.19
ip forward-protocol nd
!
no ip http server
ip http access-class 23
ip http authentication local
no ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
ip route 0.0.0.0 0.0.0.0 145.47.188.19
ip route 0.0.0.0 0.0.0.0 145.47.188.4
ip route 10.196.8.0 255.255.255.0 192.168.8.100
ip route 145.47.185.0 255.255.255.0 145.47.188.19
ip route 192.168.5.0 255.255.255.0 145.47.188.19
!
logging trap warnings
logging host 145.47.188.37
!
nls resp-timeout 1
cpd cr-id 1
!
snmp-server community nbplc RO
snmp-server enable traps isdn layer2
snmp-server host 145.47.188.37 nbplc
tacacs-server host 145.47.188.48 key 7 135406131114173D79
tacacs-server host 145.47.183.92 key 7 014217054113151873
!
!
!
control-plane
!
!
voice-port 0/0/0:15
cptone C1
!
voice-port 0/2/0
cptone C1
connection plar opx 850
!
voice-port 0/2/1
cptone C1
connection plar opx 850
!
voice-port 0/2/2
cptone C1
connection plar opx 850
!
voice-port 0/2/3
cptone C1
connection plar opx 850
!
!
!
!
!
mgcp
mgcp call-agent 10.196.8.7 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 inhibit
mgcp bind control source-interface GigabitEthernet0/0.5
mgcp bind media source-interface GigabitEthernet0/0.5
mgcp behavior rsip-range tgcp-only
mgcp behavior comedia-role none
mgcp behavior comedia-check-media-src disable
mgcp behavior comedia-sdp-force disable
!
mgcp profile default
!
sccp local GigabitEthernet0/0.5
sccp ccm 10.196.8.9 identifier 3 priority 3 version 6.0
sccp ccm 10.196.3.7 identifier 2 priority 2 version 6.0
sccp ccm 10.196.8.7 identifier 1 priority 1 version 6.0
sccp
!
sccp ccm group 1
bind interface GigabitEthernet0/0.5
associate ccm 1 priority 1
associate ccm 2 priority 2
associate ccm 3 priority 3
associate profile 3 register MTPLAG
associate profile 2 register XCODELAG
associate profile 1 register CONFLAG
switchback method graceful
!
ccm-manager music-on-hold
!
ccm-manager mgcp
no ccm-manager fax protocol cisco
ccm-manager config server 10.196.8.6 10.196.8.7
ccm-manager config
ccm-manager download-tones
!
dspfarm profile 2 transcode
codec g729abr8
codec g729ar8
codec g711alaw
codec g711ulaw
codec g729r8
codec pass-through
rsvp
maximum sessions 23
associate application SCCP
!
dspfarm profile 1 conference
codec g729br8
codec g729r8
codec g729abr8
codec g729ar8
codec g711alaw
codec g711ulaw
maximum sessions 4
associate application SCCP
!
dspfarm profile 3 mtp
codec g711ulaw
codec pass-through
rsvp
maximum sessions software 100
associate application SCCP
shutdown
!
dial-peer voice 9990020 pots
service mgcpapp
port 0/2/0
!
dial-peer voice 9990021 pots
service mgcpapp
port 0/2/1
!
dial-peer voice 9990022 pots
service mgcpapp
port 0/2/2
!
dial-peer voice 9990023 pots
service mgcpapp
port 0/2/3
!
dial-peer voice 99900015 pots
service mcpapp
!
!
!
!
gatekeeper
shutdown
!

Scott Leport · ‎02-03-2022

Hi,

You may need to add this, based on the call disconnecting with cause code 21.

voice service voip
ip address trusted list
 ipv4 10.196.8.6
 ipv4 10.196.8.7
 ipv4 10.196.3.7

In IOS 15.X they introducted toll fraud prevention to ensure that the gateway didn't process calls from untrusted sources.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/manual/cmeadm/cmetoll.html

If you were using H.323 or SIP, you would be using dial-peers and session targets defined there are implictly trusted. As you're using MGCP, I am not sure that's the case here. So try adding that and test again.

ugwuugochukwuk · ‎02-03-2022

Hello Scott, I just added the commands and still calls can't get through

Georg Pauwen · ‎02-03-2022

Hello,

first of all, looking at your config, I noticed the line:

--> ip default-gateway 192.168.8.19

Not sure what that is for, but remove that line.

Also, you have two static default routes:

--> ip route 0.0.0.0 0.0.0.0 145.47.188.19
--> ip route 0.0.0.0 0.0.0.0 145.47.188.4

I don't know what the next hops are, and what your topology looks like, but be aware that two default static routes cause all traffic to be load balanced between both routes.

As for the actual problem: did this config ever work ? One thing you could try is change the framing on the E1 controller to 'NO-CRC4'.

Also, try and change the cable for the E1 port, as line code and path violations are often, as stated, caused by layer 1 physical problems.

What router model is that anyway ?

ugwuugochukwuk · ‎02-03-2022

The router model is 3945, the commands you mentioned have been on the router. I just checked the previous running config and it was there.

Scott Leport · ‎02-03-2022

Hi.

I suggest you go back to the ISP and find out how the circuit is supposed to be built, e.g ISDN switch-type, framing etc as this will take away any guesswork.
Once that’s been confirmed and you have these settings configured correctly, issue the command &ldquo

show isdn status

” to confirm layer 1 through to 3 is good. You are looking for the “Multiframe Established” in the command output.
Then perhaps fix some of the config Georg identified, if applicable.

Also if you’re running MGCP, I would also check your CUCM to make sure it’s been added correctly and confirm your gateway is registered to your CUCM.

ugwuugochukwuk · ‎02-04-2022

Hello Scott,

Thanks for the response.

The ISP confirmed framing is CRC4, isdn switch type is primary net5.

However this is the output from the Voice gateway:

SRST-HQ#sh isdn status
Global ISDN Switchtype = primary-4ess

%Q.931 is backhauled to CCM MANAGER 0x0003 on DSL 0. Layer 3 output may not apply

ISDN Serial0/0/0:15 interface
dsl 0, interface ISDN Switchtype = primary-net5
L2 Protocol = Q.921 0x0000 L3 Protocol(s) = CCM MANAGER 0x0003
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0xFFFF7FFF
Number of L2 Discards = 0, L2 Session ID = 25
Total Allocated ISDN CCBs = 0
SRST-HQ#

Does it matter that the global isdn switch is 4ess ???

Scott Leport · ‎02-04-2022

Hi

Switch-Type configured at interface level supercedes what is configured at global level. Refer to this link for reference on that:

https://docstore.mik.ua/univercd/cc/td/doc/product/software/ios113ed/113t/113t_3/multisdn.htm

However, if you only have one PRI configured on the gateway, for simplicity it would be best to configure your global ISDN switch-type as Primary-Net5 too.

However, as your gateway is configured for MGCP, the call routing intelligence is in the CUCM so changing the switch-type would be done at that level. The setting you need is PRI EURO.

Did you confirm whether or not the gateway was registered to CUCM?