[SIPForum-discussion] Media Port change in SDP

[Banda, Srinivas (Srinivas)]

Hi Amit, 

Re-Invite is used to change/ modify the session parameters. So in this case use A switching from Audio call to Audio+Video call, so it is ok change the RTP port of Audio. 

Regards
Srinivas


On 27-Jul-2013, at 8:42 PM, "Amit Salunkhe" <amitsalunkhe21 at gmail.com> wrote:

> 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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