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Incoming calls T1 CAS on SRST gateway. Phones doesn't ring and no codec.

sergiodovinte
Level 1
Level 1

I have a 2800 router connected trough VPN with a CallManager 4.2.

It has a T1 CAS configured and it works ok with MGCP.

My problem is when the connection between the router and the CM fails and the SRST mode is enabled.

If I call the T1 number I can hear the calling signal but none of the phones ring. It also shows Codec=None with the 'show active voice call status' command

Here is the router is on MGCP Fallback mode:

GW-S#sh ccm

MGCP Domain Name: GW-S.ccmdom.local

Priority        Status                   Host

============================================================

Primary         Down                     CM1 (192.168.0.1)

First Backup    Down                     CM2 (192.168.0.2)

Second Backup   None


Current active Call Manager:    None

Backhaul/Redundant link port:   2428

Failover Interval:              30 seconds

Keepalive Interval:             15 seconds

Last keepalive sent:            15:41:06 gmt Dec 2 2010 (elapsed time: 00:01:03)

Last MGCP traffic time:         15:40:36 gmt Dec 2 2010 (elapsed time: 00:01:33)

Last failover time:             15:41:08 gmt Dec 2 2010 from (192.168.70.1)

Last switchback time:           15:41:38 gmt Dec 2 2010 from (192.168.70.2)

Switchback mode:                Immediate

MGCP Fallback mode:             Enabled/ON

Last MGCP Fallback start time:  15:41:41 gmt Dec 2 2010

Last MGCP Fallback end time:    03:34:36 gmt Nov 30 2010

MGCP Download Tones:            Disabled

I call the T1's phone number and when the call is established the first thing I see on the router is this message:

*Dec  2 21:49:09.345: %CALL_CONTROL-6-APP_NOT_FOUND: Application mgcpapp in dial-peer 999010991 not found.  Handing callid 50 to the alternate app default.

With the call established ....

GW-S#sh voice call stat

CallID     CID  ccVdb      Port        DSP/Ch  Called #   Codec    Dial-peers

0x31       1247 0x48A411F4 0/1/0:1.1   0/1:1  *           None     999010991/-

GW-S#sh call active voice brief

<ID>: <CallID> <start>hs.<index> +<connect> pid:<peer_id> <dir> <addr> <state>

  dur hh:mm:ss tx:<packets>/<bytes> rx:<packets>/<bytes>

IP <ip>:<udp> rtt:<time>ms pl:<play>/<gap>ms lost:<lost>/<early>/<late>

  delay:<last>/<min>/<max>ms <codec>


media inactive detected:<y/n> media cntrl rcvd:<y/n> timestamp:<time>


long duration call detected:<y/n> long duration call duration :<sec> timestamp:<time>

  MODEMPASS <method> buf:<fills>/<drains> loss <overall%> <multipkt>/<corrected>

   last <buf event time>s dur:<Min>/<Max>s

FR <protocol> [int dlci cid] vad:<y/n> dtmf:<y/n> seq:<y/n>

  <codec> (payload size)

ATM <protocol> [int vpi/vci cid] vad:<y/n> dtmf:<y/n> seq:<y/n>

  <codec> (payload size)

Tele <int> (callID) [channel_id] tx:<tot>/<v>/<fax>ms <codec> noise:<l> acom:<l> i/o:<l>/<l> dBm

  MODEMRELAY info:<rcvd>/<sent>/<resent> xid:<rcvd>/<sent> total:<rcvd>/<sent>/<drops>

         speeds(bps): local <rx>/<tx> remote <rx>/<tx>

Proxy <ip>:<audio udp>,<video udp>,<tcp0>,<tcp1>,<tcp2>,<tcp3> endpt: <type>/<manf>

bw: <req>/<act> codec: <audio>/<video>

  tx: <audio pkts>/<audio bytes>,<video pkts>/<video bytes>,<t120 pkts>/<t120 bytes>

rx: <audio pkts>/<audio bytes>,<video pkts>/<video bytes>,<t120 pkts>/<t120 bytes>



Telephony call-legs: 1

SIP call-legs: 0

H323 call-legs: 0

Call agent controlled call-legs: 0

SCCP call-legs: 0

Multicast call-legs: 0

Total call-legs: 1

124B : 50 270124840ms.1 +-1 pid:999010991 Answer  connected

dur 00:00:00 tx:0/0 rx:0/0

Tele 0/1/0:1 (50) [0/1/0.1] tx:0/0/0ms None noise:0 acom:0  i/0:0/0 dBm


Telephony call-legs: 1

SIP call-legs: 0

H323 call-legs: 0

Call agent controlled call-legs: 0

SCCP call-legs: 0

Multicast call-legs: 0

Total call-legs: 1

My configuration------------------------------------------------------------------

version 12.4

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

!

hostname GW-S

!

boot-start-marker

boot system flash:c2800nm-adventerprisek9-mz.124-4.XC5.bin

boot-end-marker

!

card type t1 0 1

enable secret 5 $1$G4vy$iZ3bbI7Ru.c571aFhts641

!

no aaa new-model

!

resource policy

!

clock timezone gmt -6

network-clock-participate wic 1

network-clock-select 1 T1 0/1/0

no ip source-route

!

!

ip cef

no ip dhcp use vrf connected

ip dhcp excluded-address 192.168.7.1 192.168.1.2

!

ip dhcp pool Pool

   network 192.168.0.0 255.255.255.0

   option 150 ip 192.168.0.1 192.168.0.2

   default-router 192.168.1.1

   dns-server 192.168.0.1 192.168.0.2

   domain-name ccmdom.local

!

!

ip tftp source-interface GigabitEthernet0/0

no ip domain lookup

ip domain name ccmdom.local

ip host CM1 192.168.0.1

ip host CM2 192.168.0.2

ip ssh version 1

!

!

isdn switch-type primary-dms100

!

voice-card 0

no dspfarm

!

!

!

voice service voip

allow-connections h323 to h323

h323

!

!

!

voice class codec 1

codec preference 1 g711ulaw

codec preference 2 g711alaw

codec preference 3 g729r8

codec preference 4 g729br8

!

!

!

voice class h323 1

h225 timeout tcp establish 3

h225 timeout setup 3

  call preserve

!

!

!

!

!

voice translation-rule 1

rule 1 /.*/ /2100/

!

voice translation-rule 2

rule 1 /^0/ //

!

voice translation-rule 20

rule 1 reject /981999999/

!

!

!

voice translation-profile Bloqueo_in

translate calling 20

!

voice translation-profile translate-in

translate called 1

!

voice translation-profile translate-out

translate called 2

!

!

!

application

global

  service alternate default

!

!

!

controller T1 0/1/0

framing sf

linecode ami

ds0-group 1 timeslots 1-24 type e&m-wink-start

description PRIMARIO

!

!

!

interface GigabitEthernet0/0

description INTERFAZ GATEWAY_1

ip address 192.168.1.1 255.255.255.0

duplex auto

speed auto

ccm-manager switchback immediate

ccm-manager fallback-mgcp

ccm-manager redundant-host CM2

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server 192.168.0.1

ccm-manager config

!

mgcp

mgcp call-agent CM1 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

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

mgcp package-capability pre-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp rtp payload-type g726r16 static

!

mgcp profile default

!

!

!

dial-peer voice 800100 pots

service mgcpapp

port 0/0/1

!

dial-peer voice 999010991 pots

service mgcpapp

port 0/1/0:1

!

dial-peer voice 800000 pots

port 0/0/0

!

dial-peer voice 999001 pots

service mgcpapp

port 0/0/1

!

!

!

call-manager-fallback

max-conferences 8 gain -6

transfer-system full-blind

ip source-address 192.168.1.1 port 2000

max-ephones 30

max-dn 20 dual-line

keepalive 120

time-format 24

date-format dd-mm-yy

!

Reading other posts I understand that my problem might be a bad dial-peer configuration. I've tried a lot of diferent configruations with the dial-peer but the result was the same. Any soul out there can help me?

4 Replies 4

Hi,

MGCP doesn't work once the callmanager is down. The gateway acts likes a H323 device. You need to have additional dial peers configured to have that working

Hello Madhusudhan and thank you for your answer.

Yes, I already know that, I forgot to include theese peers on the configuration output:

dial-peer voice 8000 pots
description INCOMING T1 CAS Mode SRST
incoming called-number .
port 0/1/0:1
!
dial-peer voice 8001 pots
description OUTGOING T1 CAS Mode SRST
destination-pattern 0T
port 0/1/0:1

With those peers added the situation remains the same:

GW-S#sh voice call stat

CallID     CID  ccVdb      Port        DSP/Ch  Called #   Codec    Dial-peers

0x4B       126D 0x48A411F4 0/1/0:1.1   0/1:1  *           None    8000/-

1 active call found

GW-S#sh call active voice brief

: hs. + pid:

  dur hh:mm:ss tx:/ rx:/

IP : rtt:

  delay://ms

media inactive detected: media cntrl rcvd: timestamp:

long duration call detected: long duration call duration : timestamp:

  MODEMPASS buf:/ loss /

   last s dur:/s

FR [int dlci cid] vad: dtmf: seq:

  (payload size)

ATM [int vpi/vci cid] vad: dtmf: seq:

  (payload size)

Tele (callID) [channel_id] tx://ms noise: acom: i/o:/ dBm

  MODEMRELAY info:// xid:/ total://

         speeds(bps): local / remote /

Proxy :

bw: / codec:

  tx:

rx:

Telephony call-legs: 1

SIP call-legs: 0

H323 call-legs: 0

Call agent controlled call-legs: 0

SCCP call-legs: 0

Multicast call-legs: 0

Total call-legs: 1

1271 : 76 337667170ms.1 +-1 pid:8000 Answer  connected

dur 00:00:00 tx:0/0 rx:0/0

Tele 0/1/0:1 (76) [0/1/0.1] tx:0/0/0ms None noise:0 acom:0  i/0:0/0 dBm

Telephony call-legs: 1

SIP call-legs: 0

H323 call-legs: 0

Call agent controlled call-legs: 0

SCCP call-legs: 0

Multicast call-legs: 0

Total call-legs: 1

Finally I've solved the problem.

voice translation-rule 1

rule 1 /.*/ /2100/

That rule pointed to 2100, that's a Hunt Pilot created in the CallManager.

While in SRST mode, CallManager is not accesible, so the router can't reach that 2100 group.

I created "alias" into the Call-Manager-Fallback section so I can emulate the 2100.