[SIPForum-discussion] Need Info - UAC behavior

[Moshe Ostrovsky]

Hi All.

 

Regarding Payload type number, can you please point to the RFC part that
sets the range validity restrictions?

 

What I could see in RFC 4566 is that there is no restriction. 

 

According to RFC 3551 - the range is 0-127.

 

What happens if I need to define dynamic codec beyond 127?

 

Thanks.

 

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of RAJESH KUMAR RAJU
Sent: Thursday, January 22, 2009 7:08 AM
To: Gowthaman Desingh
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Need Info - UAC behavior

 

Dear Gowtham, 


*m=audio 6000 RTP/AVP 12345*

 *a=rtpmap:8 PCMA/8000*

 

Any Objective behind doing this , because as per rfc  , i have never
seen any one doing like this . and 12345 must be a valid defined 

Payliad type and also the Payload type number must be in the defined
range .. u can check the rfc .

 

 



------- Original Message -------
Sender : Gowthaman Desingh<gowtham_dgm at rediffmail.com>
Date : Jan 21, 2009 15:31 (GMT+09:00)
Title : [SIPForum-discussion] Need Info - UAC behavior

Hi All,
  I would like to know the expected behavior of the UAC in the below
mentioned scenario.

Setup:
        |SIP Phone | -------- |sipp| 
    I have connected a SIP phone back to back with SIPP.

1. I send an INVITE request from the SIP Phone to the sipp with the
below mentioned SDP offer.
**********************************
v=0
o=SIPUA 22986 0 IN IP4 9.7.40.253
s=SIP Call
t=0 0
m=audio 19570 RTP/AVP 0 8 18 102 9 101
c=IN IP4 9.7.40.253
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:102 L16/16000
a=rtpmap:9 G722/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
**********************************

2. Accept the call from sipp by sending 200 OK.
  In the 200 OK sent by the sipp, I send the below mentioned SDP answer.
The payload number mentioned in the m=line is "12345"(which is invalid).
But the payload number mentioned in the attribute is valid (8 - PCMA). 
**********************************
v=0
o=user1 53655765 2353687637 IN IP4 9.7.40.50
s=-
t=0 0
a=recvonly
c=IN IP4 9.7.40.50
*m=audio 6000 RTP/AVP 12345*
c=IN IP4 9.7.40.50
*a=rtpmap:8 PCMA/8000*
a=sendonly
*********************************** 


My phone is sending 200 OK followed by BYE to terminate the call. Is
that a valid behavior. 

Thanks,
Gowthaman D
  

u can reach me on my mobile @ +919886625873

 
<http://adworks.rediff.com/cgi-bin/AdWorks/click.cgi/www.rediff.com/sign
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S_QUERY=null> 

 

 

 

 

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