[SIPForum-discussion] Query regarding RTP/AVP Media Profiles

[Matthew Pragnell]

Hi,

 

I wonder if anyone can help me. 

 

I have a fault which is affecting our IP Call Control platform. I
receive an INVITE, in the SDP, the codec list specifies g729 variants
(Media Description, name and address (m): audio 32206 RTP/AVP 18 18 18
18 0 8 96). I think that the reason it is hanging in our IP call element
is because there is some missing media attribute information in the SDP
for example (a=fmtp:18 annexb=no). This specifies which variant of G729
to use. 

 

SDP

v=0

o=msx-mitry-2 2147483647 1 IN IP4 x.x.x.x

s=sip call

c=IN IP4 84.103.233.85

t=0 0

m=audio 35864 RTP/AVP 18 18 18 18 0 8 96

a=rtpmap:96 telephone-event/8000

a=sendrecv

a=ptime:20

a=rtpmap:8 PCMA/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:18 G729B/8000

a=rtpmap:18 G729AB/8000

a=rtpmap:18 G729A/8000

a=rtpmap:18 G729/8000

m=image 35866 udptl t38

a=T38FaxRateManagement:transferredTCF

a=T38FaxUdpEC:t38UDPRedundancy

a=T38MaxBitRate:14400

a=T38FaxVersion:0

 

Can someone confirm if this is correct and add any additional
information which would be helpful.

 

Thanks

 

Matt Pragnell
UK Network Support Engineer 

T

+44 207 628 9833

 

F

+44 207 628 5262

M

+44 77 9542 6125

E

matthew.pragnell at tnzi.com <mailto:steve.burgess at tnzi.com> 

W

www.tnzi.com <http://www.tnzi.com/> 

TNZUK Suite, C/O IX Europe 
101, Finsbury Pavement, 
London, EC2A 1RS, UK

 


This communication, including any attachments, is confidential. If you are not the intended recipient, you should not read it - please contact me immediately, destroy it, and do not copy or use any part of this communication or disclose anything about it. Thank you. Please note that this communication does not designate an information system for the purposes of the Electronic Transactions Act 2002.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20070903/5b96f489/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 2409 bytes
Desc: image001.jpg
URL: <http://sipforum.org/pipermail/discussion/attachments/20070903/5b96f489/attachment.jpg>