[c-nsp] SIP to ISDN Call Progress

[Marco Marzetti]

On Mon, 15 Nov 2010 13:44:26 +0100, Roger Wiklund <copse at xy.org> wrote:
> Exactly what problems are you experiencing? One way audio? No
> ringback? DTMF issues etc?
> 
> Have you tried voice rtp send-recv? This is used for cut Through
> Two-Way Audio Early. Not sure it will help though.
> 
>
http://www.cisco.com/en/US/docs/ios/12_2/voice/command/reference/vrf_t.html#wp1076026
> 
> /Roger
> 
> On Mon, Nov 15, 2010 at 10:36 AM, Marco Marzetti <marco at lamehost.it>
wrote:

Hello,

I'm experiencing no audio in the backward direction when in-band
information are
generated from the remote switch.
I'm unable to hear other telco's alert messages, like "The number you've
dialed is not in service".

Thank You

>>
>> Hello,
>>
>> I have a problem with SIP to ISDN internetworking on Cisco IOS.
>> I'm unable to receive early-media messages from the ISDN side of the
>> call.
>> Hardware and software versions are: Cisco 2800 Software
>> (C2800NM-ENTSERVICES-M), Version 12.4(20)T6, RELEASE SOFTWARE (fc2).
>>
>> # debug isdn q931 int Se0/1/0:15
>> Nov 15 10:06:54.437 CET: ISDN Se0/1/0:15 Q931: Applying typeplan for
>> sw-type 0x12 is 0x0 0x1, Calling num 03631970XXX
>> Nov 15 10:06:54.441 CET: ISDN Se0/1/0:15 Q931: Sending SETUP  callref =
>> 0x0D0D callID = 0x980D switch = primary-net5 interface = User
>> Nov 15 10:06:54.441 CET: ISDN Se0/1/0:15 Q931: TX -> SETUP pd = 8
>>  callref
>> = 0x0D0D
>>        Bearer Capability i = 0x8090A3
>>                Standard = CCITT
>>                Transfer Capability = Speech
>>                Transfer Mode = Circuit
>>                Transfer Rate = 64 kbit/s
>>        Channel ID i = 0xA9839F
>>                Exclusive, Channel 31
>>        Calling Party Number i = 0x0180, '03631970XXX'
>>                Plan:ISDN, Type:Unknown
>>        Called Party Number i = 0x81, '199151119'
>>                Plan:ISDN, Type:UnknownsipSPIUpdateRtcpSession: sx79861:
>> started RTP
>> timer in state STATE_SENT_ALERTING
>>
>> Nov 15 10:06:54.457 CET: ISDN Se0/1/0:15 Q931: RX <- SETUP_ACK pd = 8
>> callref = 0x8D0D
>>        Channel ID i = 0xA9839F
>>                Exclusive, Channel 31
>>
>>
>> Nov 15 10:06:56.745 CET: ISDN Se0/1/0:15 Q931: RX <- CALL_PROC pd = 8
>> callref = 0x8D0D
>> Nov 15 10:07:18.206 CET: ISDN Se0/1/0:15 Q931: RX <- ALERTING pd = 8
>> callref = 0x8D0D
>> Nov 15 10:07:18.302 CET: ISDN Se0/1/0:15 Q931: RX <- CONNECT pd = 8
>> callref = 0x8D0D
>> Nov 15 10:07:18.302 CET: %ISDN-6-CONNECT: Interface Serial0/1/0:30 is
now
>> connected to 199151119 N/A
>> Nov 15 10:07:18.302 CET: %ISDN-6-CONNECT: Interface Serial0/1/0:30 is
now
>> connected to 199151119 N/A
>> Nov 15 10:07:18.302 CET: %ISDN-6-CONNECT: Interface Serial0/1/0:30 is
now
>> connected to 199151119 N/A
>> Nov 15 10:07:18.302 CET: ISDN Se0/1/0:15 Q931: TX -> CONNECT_ACK pd = 8
>> callref = 0x0D0DsipSPIUpdateRtcpSession: sx79861: started RTP timer in
>> state STATE_SENT_ALERTING
>>
>> Nov 15 10:07:21.294 CET: %ISDN-6-CONNECT: Interface Serial0/1/0:30 is
now
>> connected to 199151119 N/A
>> Nov 15 10:07:21.294 CET: %ISDN-6-DISCONNECT: Interface Serial0/1/0:30
>> disconnected from 199151119 , call lasted 2 seconds
>> Nov 15 10:07:21.294 CET: ISDN Se0/1/0:15 Q931: TX -> DISCONNECT pd = 8
>> callref = 0x0D0D
>>        Cause i = 0x8090 - Normal call clearing
>> Nov 15 10:07:21.306 CET: ISDN Se0/1/0:15 Q931: RX <- RELEASE pd = 8
>> callref = 0x8D0D
>> Nov 15 10:07:21.306 CET: ISDN Se0/1/0:15 Q931: TX -> RELEASE_COMP pd =
8
>> callref = 0x0D0D
>>
>> The router places the call to our public switch and cut-through the
voice
>> path only after the CONNECT message ignoring the CALL_PROC messages and
>> the
>> relative early-audio
>> stream.
>> Looking at the SIP side of the call no "SIP 183 Progress" is sent by
the
>> router between the "Trying" and the "Ringing" messages.
>>
>> I would expect the router to generate proper SIP signaling and
>> cut-through
>> in the backward direction the voice path after the CALL_PROC message
has
>> been received.
>>
>> Any help?
>>
>> Thank you
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