[SIPForum-discussion] Query regarding offer-answewr

dipanjan.dutta at aricent.com dipanjan.dutta at aricent.com
Thu Jul 12 06:01:49 UTC 2007

Hello Chandan,

The fact that B responds with 2 out of original 3 choices of codecs A 
sent, is A and B both are capable of decoding those 2 codecs - say X and Y

For each m-line negotiated (agreed between A and B), both A and B shares 
their RTP ports.

So, it is understood that both A and B would be listening on each of the 2 
ports they respectively announced. Inherently, wherever a data is being 
received, that data will be decoded using RTP header information (Payload 
Type, etc.). Through the initial negotiation, it is understood, both A and 
B are capable of decoding the data whether it is of X-type or Y-type.


"chandan kumar anjani" <chandan.anjani at gmail.com> 
Sent by: discussion-bounces at sipforum.org
07/11/2007 10:33 PM

discussion at sipforum.org

[SIPForum-discussion] Query regarding offer-answewr


 I have a query regarding offer-anser.

Suppose A party sends offer with 3 'm' line. then my question is that 

1. B party can send 2 out of the 3 received 'm' line or not.
2. if yes ,then which wud be used for opening RTP connection. 

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