[SIPForum-discussion] Media Port change in SDP

[Kashif Husain]

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.

>> Yes. This is a correct behaviour, check rfc3264 section 8.3.

Also whether B party or media anchoring device(SBC/Softswitch) need to
accept this change?
>> Your SBC/Softswitch should not reject the new offer just because the
audio port has been changed.

Thanks,
-kashif

On Sat, Jul 27, 2013 at 10:18 AM, 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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