[SIPForum-discussion] Question About media attribute within SDP

[John Atkinson]

see RFC 3389 - and, CN is statically mapped to 13 - see RFC 3551 

-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Shakil, Rashid
Sent: Friday, July 24, 2009 10:21 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Question About media attribute within SDP

Hello All,

 

For outbound calls the customer's Cisco IAD 2431 generating following
SDP. The SIP peer doesn't like the media parameter "a=rtpmap:19 CN/8000"
in following SDP.  Two quick questions,

 

1.       What "a=rtpmap:19 CN/8000" represent in this SDP

2.       How can it be removed

3.       Is it possible that it cause fax failures ?

 

 

v=0

o=- 2847654225 2847654225 IN IP4 72.245.184.130

s=SIP Call

c=IN IP4 67.102.244.5

t=0 0

m=audio 17746 RTP/AVP 0 101 19

c=IN IP4 67.102.244.5

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=rtpmap:19 CN/8000

a=ptime:20

 

Thanks in advance for the input

 

Regards,

 

Rashid Shakil