NO AUDIO FOR SPECIFIC NUMBERS

[ainaraza1]

Hello;

       I am having problems regarding no audio in specific numbers. The scenario is

              SIP TRUNK                                 SIP TRUNK                                 SIP TRUNK

ITSP -------------------------------> CUBE -------------------------> CUCM -------------------------------> IP PHONE

Codec being used is g711alaw and the number dialed is a u.s number i.e 0018773473393

Debugs are attached and any help will be appreciated

[Jonathan Els]

Hi Raza

This signalling flow looks fine, so we need to look at SDP and the RTP communications here.  

So it looks to me that you have MTP'd the call onto a software MTP on CUCM?  I say this because of the inbound SDP from CUCM has the same IP for media as for signalling:

=0
o=CiscoSystemsCCM-SIP 6188936 1 IN IP4 10.200.15.20
s=SIP Call
c=IN IP4 10.200.15.20
t=0 0
m=audio 27900 RTP/AVP 8 101

Please can you confirm/provide:

• sh run for CUBE please

• We need to look at any binding for 10.99.1.23 and why this is differing from 10.200.100.27 in your outbound Call-ID.  This is the interface that's being used for external media in the B2BUA.
• Please can you confirm connectivity to your ITSP's 125.209.93.196 media IP (specified in ITSP's 180 Early Media and 200 OK CSeq INVITE).  We are looking specifically for communication to/from 10.99.1.23 based on your current configuration

Thanks

 - Jonathan

[Jonathan Els]

Also, since you're saying that this is only impacting certain calls going out to the same carrier, can I ask that you please provide a debug for a working call, let's look at the media communication and see if we can find a discernible difference.

 - Jonathan

[Mohammed al Baqari]

Hi,

Looking at your debugs, it could be routing or binding problem. Please share CUBE config and the following command during active call (called number is 0018773473393)

sh call active voice brief called-number 0018773473393