Intermittent incoming call

[chingkiatlee]

Hi everyone,

I have a problem with intermittent incoming call from outsider to my CUCM 7.1.

I am using the H323 protocol between CUCM 7.1 with Voice gateway Cisco 3725.

When i do the debug isdn q931, i saw the incoming call has reach my voice gw, but the tone is engage even thought the IP Phone is free & connected.

I have no problem with internal call. When i try to call 10 times consequently, i saw all the call has reach my voice gateway. But around 6-5 is engage tone.

kindly help.

[William Bell]

Have you checked for H323 messages on the CUCM Call Manager trace? You can also check "debug h225 q931" or "debug voice ccapi" on the voice gateway to try and zero in on the issue. Given the intermittent nature of the problem I am wondering if you have more than one dial-peer on your voice gateway that matches the destination pattern that would include your IP phone. If this is the case then I wonder if the dial-peers have equal preference. If this is the case and one of the dial-peers is pointing to an incorrect CUCM address then that could explain the issue. If you have multiple dial-peers with equal preference and you believe the configs are OK, then you can at least narrow your fault zone.

So, assume you have configs that are OK (in your belief) and you have more than one voip dial-peer for your CUCM cluster. Shut one of the dial-peers down and place a call from the PSTN. Is your issue the same? Are all calls failing or succeeding? Re-enable that dial peer and shut one of the other ones down. Run the same test. Do you have the same result? If you find that there is some consistency with the issue, focus on the dial-peer giving you the problem.

Note, I am just picking one common issue that could be occurring. At this point, we only know that 100% of calls make to your voice gateway and 50 - 65% make it beyond. You need to look at the GW-to-CUCM side of the equation to narrow things down further.

HTH.

Regards,
Bill

[chingkiatlee]

Attached below is my config

boot-start-marker
boot-end-marker
!
!
clock timezone MY 8
no network-clock-participate slot 1
voice-card 1
dspfarm
!
no aaa new-model
ip subnet-zero
ip cef
!
!
ip dhcp excluded-address 172.17.0.1 172.17.0.20
ip dhcp excluded-address 172.25.0.1 172.25.0.20
!
ip dhcp pool voice
   network 172.17.0.0 255.255.248.0
   default-router 172.17.0.1
   option 150 ip 172.17.0.5 172.17.0.6
!
ip dhcp pool voice-new
   network 172.25.0.0 255.255.248.0
   default-router 172.25.0.1
   option 150 ip 172.25.0.4 172.25.0.5
!
no ftp-server write-enable
isdn switch-type primary-net5
!
!
!
voice service pots
!
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g711alaw
!
!
!
!
!
!
!
!
!
!
!
controller E1 1/0
pri-group timeslots 1-31
!
controller E1 1/1
pri-group timeslots 1-31
!
!
!
interface FastEthernet0/0
ip address 172.25.0.8 255.255.248.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial1/0:15
no ip address
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp enable
!
interface Serial1/1:15
no ip address
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp enable
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.25.0.1
ip http server
!
!
!
!
voice-port 1/0:15
echo-cancel coverage 32
cptone MY
timeouts initial 0
timeouts interdigit 2
!
voice-port 1/1:15
echo-cancel coverage 32
cptone MY
timeouts initial 0
timeouts interdigit 2
!
!
!
!
!
dial-peer voice 2002 voip
preference 5
destination-pattern .T
progress_ind setup enable 3
voice-class codec 1
session target ipv4:172.25.0.4
dtmf-relay h245-alphanumeric
!
dial-peer voice 2003 voip
preference 1
destination-pattern .T
progress_ind setup enable 3
voice-class codec 1
session target ipv4:172.25.0.5
dtmf-relay h245-alphanumeric
!
dial-peer voice 1002 pots
preference 1
destination-pattern .T
progress_ind alert enable 8
direct-inward-dial
port 1/1:15
forward-digits all
!
dial-peer voice 1003 pots
preference 3
destination-pattern .T
progress_ind alert enable 8
direct-inward-dial
port 1/0:15
!
!
line con 0
line aux 0
line vty 0 4
password cisco123
login
!
ntp clock-period 17180644
ntp master
ntp server 172.16.10.21
end

[orochi_yagami]

Hi Ching Kiat,

What is the caused code when you do debug isdn q931 and the call received busy tone?

Thanks.

[chingkiatlee]

Hi, When i did the debug isdn q931, i saw the traffic is hit the voice gw even thought the line is engage tone.

[chingkiatlee]

Dear all,

The problem has been solved afte upgrade the iOS

Sent from Cisco Technical Support iPhone App