[SIPForum-discussion] Media Port change in SDP
Steve Underwood
steveu at coppice.org
Mon Aug 5 03:50:48 UTC 2013
On 07/27/2013 12:48 PM, Amit Salunkhe 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-
>
Others have commented that this is compliant behaviour, but more
importantly, from a practical point of view, it is common practice. Many
systems handle voice on some boxes, video on others, FAX on a third
group, etc. So, its something you will often see in the real world, and
you must handle correctly.
Regards,
Steve
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