[Sip] Need opinion

[<[e-mail]>]

HI All,

 

I am some doubt regarding the RFC4566.

 

According to RFC,

 

Up to one rtpmap attribute can be defined for each media format

specified. Thus, we might have the following:

=======================================

m=audio 49230 RTP/AVP 96 97 98

a=rtpmap:96 L8/8000

a=rtpmap:97 L16/8000

a=rtpmap:98 L16/11025/2

======================================

 

 

But what if the scenario is like the following,

 

"m=audio 12167 RTP/AVP 103 98 99 0 101 8 9 18 97 4 120 114 115 116
117\r\n" & 
"c=IN IP4 " & v_userA.userhost & "\r\n" & 
"a=rtpmap:103 AMR/8000/1\r\n" & 
"a=fmtp:103 mode-set=0,1,2,3,4,5,6,7;octet-align=0\r\n" & 
"a=rtpmap:98 AMR/8000/1\r\n" & 
"a=fmtp:98 mode-set=0,1,2,3,4,5,6,7;octet-align=0\r\n" & 
"a=rtpmap:99 AMR/8000/1\r\n" & 
"a=fmtp:99 mode-set=0,1,2,3,4,5,6,7;octet-align=0\r\n" & 
"a=rtpmap:0 PCMU/8000/1\r\n" & 
"a=rtpmap:101 telephone-event/8000/1\r\n" & 
"a=fmtp:101 0-15\r\n" & 
"a=rtpmap:8 PCMA/8000/1\r\n" & 
"a=rtpmap:98 AMR/8000/1\r\n" & 
"a=fmtp:9 bitrate=48,56,64\r\n" & 
"a=rtpmap:18 G729/8000/1\r\n" & 
"a=rtpmap:97 EVRC0/8000/1\r\n" & 
"a=rtpmap:4 G723/8000/1\r\n" & 
"a=fmtp:4 bitrate=5.3,6.3;annexb=yes\r\n" & 
"a=rtpmap:120 AMR-WB/16000/1\r\n" & 
"a=fmtp:120 mode-set=0,1,2,3,4,5,6,7,8;octet-align=1\r\n" & 
"a=rtpmap:114 G726-16/8000/1\r\n" & 
"a=rtpmap:115 G726-24/8000/1\r\n" & 
"a=rtpmap:116 G726-32/8000/1\r\n" & 
"a=rtpmap:117 G726-40/8000/1\r\n"

 

If you see the red marked attribute this same attribute is getting
repeated in the SDP.

 I just want to confirm, is this  acceptable behavior?

 

Can anyone please share his views regarding this?

 

If this is not the right forum to ask this question can you please
direct me to the concern forum?

 

Thanks & Regards,

Sulabh