[SIPForum-discussion] Media Port change in SDP

[Saurabh Shah]

Any end point can change SDP at any time during call using Re-INITE provided that version number in SDP must increment. 


Acceptance of such Re-INVITE is depends on the policy of UAS. 


Regards, 
Saurabh Shah 

----- Original Message -----

From: "Amit Salunkhe" <amitsalunkhe21 at gmail.com> 
To: discussion at sipforum.org 
Sent: Saturday, July 27, 2013 10:18:34 AM 
Subject: [SIPForum-discussion] Media Port change in SDP 


Hi All, 


Call scenario is 


1. A Calls B (Audio Call) 
2. Call got connected 
3. Now A want to switch that call to Video hence A User end device send Re-INVITE with Audio + video SDP 
4. Call got connected as B Party accept that Video Call offer. 


Now the change we found in SDP Audio part is- Initial Audio call A offer Audio/Media port as 1001 but while offering Video call with Re-invite A party end device change Audio Port to 2000. 


My question is this correct behavior? is there any RFC/Standard docs describe this valid or invalid to change media port for call type change in same session. 


Also whether B party or media anchoring device(SBC/Softswitch) need to accept this change? 




Amit- 

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