No ringback on H.323 ISDN PRI

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Sep 20th, 2010
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Hi,


Got a H.323 2821 (C3825-SPSERVICESK9-M), Version 12.4(25d) where we do not get ringback from service provider. See debug and dialpeer below. Can someone help me resolve this one? Service provider are pointing finger at us and TAC have pointed it back to them!


*Sep 20 13:04:23.479: ISDN Se0/0/0:15 Q931: RX <- SETUP pd = 8  callref = 0x1836

        Bearer Capability i = 0x8090A3
                Standard = CCITT
                Transfer Capability = Speech
                Transfer Mode = Circuit
                Transfer Rate = 64 kbit/s
        Channel ID i = 0xA1839E
                Preferred, Channel 30
        Progress Ind i = 0x8481 - Call not end-to-end ISDN, may have in-band inf
o
        Calling Party Number i = 0x2083, '7895678764'
                Plan:Unknown, Type:National
        Called Party Number i = 0xA1, '6608'
                Plan:ISDN, Type:National
        Sending Complete
*Sep 20 13:04:23.487: ISDN Se0/0/0:15 Q931: TX -> CALL_PROC pd = 8  callref = 0x
9836
        Channel ID i = 0xA9839E
                Exclusive, Channel 30
*Sep 20 13:04:23.503: ISDN Se0/0/0:15 Q931: TX -> ALERTING pd = 8  callref = 0x9
836
        Progress Ind i = 0x8188 - In-band info or appropriate now available
*Sep 20 13:04:27.227: ISDN Se0/0/0:15 Q931: RX <- DISCONNECT pd = 8  callref = 0
x1836
        Cause i = 0x8090 - Normal call clearing
*Sep 20 13:04:27.227: ISDN Se0/0/0:15 Q931: TX -> RELEASE pd = 8  callref = 0x98
36
*Sep 20 13:04:27.275: ISDN Se0/0/0:15 Q931: RX <- RELEASE_COMP pd = 8  callref =
0x1836


Dialpeer:


dial-peer voice 11 pots
  preference 1
destination-pattern 9T
progress_ind setup enable 3
progress_ind alert enable 8
progress_ind progress enable 8
progress_ind connect enable 8
translate-outgoing calling 8
translate-outgoing called 10
incoming called-number .
direct-inward-dial
port 0/0/0:15
forward-digits all


Help!


Rich

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Steven Holl Mon, 09/20/2010 - 07:33
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  • Cisco Employee,

The provider is providing in-band ringback.



*Sep 20 13:04:23.503: ISDN Se0/0/0:15 Q931: TX -> ALERTING pd = 8  callref = 0x9
836
        Progress Ind i = 0x8188 - In-band info or appropriate now available



We need to see what the VoIP leg is doing, though.


Collect q931 debugs in parallel with:

debug voip ccapi inout

debug h225 asn1

debug h245 asn1

debug ip tcp trans

debug cch323 all


Collect as follows:

Router(config)# service sequence
Router(config)# service timestamps debug datetime msec
Router(config)# logging buffered 10000000 7
Router(config)# no logging con
Router(config)# no logging mon
Router(config)# voice iec syslog

Router# term len 0

Router# sh logg



When the alerting with PI of 8 is received, you should see a PI of 8 on the CCAPI legs, and H245 address should be exchanged by the h225 alerting.  Then make sure OLCs get exchanged/acked.  If that's good and you still don't have ringback, get a PCM capture and see if you see ringback in the audio from the provider.

richb1971 Fri, 09/24/2010 - 06:39
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Removed the progress_ind from the voip dial peer and Service Provider provided ringback - fixed.


Thanks.

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