[Asterisk-video] capability translation from h245 to SIP

[Dan Julius]

Most of the phones I've tested with also support MPEG4

receiveVideoCapability genericVideoCapability standard 0.0.8.245.1.0.0

             maxBitRate = 521



I think it would make much to support this codec as well.
Can you give me pointers as to which parts of the code you think might need
to be modified?

Thanks,
Dan

On Thu, Sep 11, 2008 at 1:02 AM, Sergio Garcia Murillo <
sergio.garcia at fontventa.com> wrote:

>  In Asterisk 1.4 the only thing that can be configured for video is de
> codec, so there is not much problem as the only one supported is
> h263-1998/2000 for sending and h263-1996 h263-1998/2000 for receiving. Using
> the videocaps branch we could map the codec parameters to the SDP offer.
>
>
> Best regards
> Sergio
>
> Dan Julius escribió:
>
> Hi, Sergio,
>
> If there is no capability mapping, how does asterisk decide what
> capabilities to put in the SDP body of the SIP Invite message?
>
>
> When I originate a call from a Nokia N73 to a SIP client, the Invite
> message includes and SDP section for video:
>
> m=video 10070 RTP/AVP 34 103
> a=rtpmap:103 h263-1998/90000
> a=sendrecv
>
>
>
> When I originate a call from a Nokia N95 the SDP is different and also
> includes the h263/9000 capability:
>
> m=video 10120 RTP/AVP 34 103
>
> a=rtpmap:34 H263/90000
> a=rtpmap:103 h263-1998/90000
> a=sendrecv
>
>
>
>
>
> Thanks,
> Dan
>
> On Tue, Sep 9, 2008 at 11:54 AM, Sergio Garcia Murillo <
> sergio.garcia at fontventa.com> wrote:
>
>>  Hi Dan,
>>
>> There is no capability negotiation, or mapping between SIP and the h245, I
>> send fixed ones For H263 and AMR:
>>
>>
>>           [0]={
>>             capabilityTableEntryNumber = 1
>>             capability = receiveAndTransmitVideoCapability
>> h263VideoCapability {
>>               qcifMPI = 2
>>               maxBitRate = 520
>>               unrestrictedVector = FALSE
>>               arithmeticCoding = FALSE
>>               advancedPrediction = FALSE
>>               pbFrames = FALSE
>>               temporalSpatialTradeOffCapability = FALSE
>>               errorCompensation = FALSE
>>             }
>>           }
>>           [1]={
>>             capabilityTableEntryNumber = 2
>>             capability = receiveAndTransmitAudioCapability
>> genericAudioCapability {
>>               capabilityIdentifier = standard 0.0.8.245.1.1.1
>>               maxBitRate = 122
>>               collapsing = 1 entries {
>>                 [0]={
>>                   parameterIdentifier = standard 0
>>                   parameterValue = unsignedMin 1
>>                 }
>>               }
>>             }
>>           }
>> .
>>
>> Best regards
>> Sergio
>>
>> Dan Julius escribió:
>>
>>  Hi,
>>
>> I'm experiencing some issues when using Asterisk as a gateway between 3G
>> and SIP clients.
>> I'm trying to complete a call using h263p as the video codec on the sip
>> client in order to avoid  video transcoding.
>> For audio I'm using AMR on the 3G side and g711 on the SIP side since most
>> SIP clients don't support AMR out of the box.
>>
>> For some phones this works without a problem while other phones don't seem
>> to show video depending on the SIP client.
>> For example: N73 works with X-Lite, but not with OpenPhone. N95 works with
>> both.
>> I've traced this down to an issue with the capability exchange,
>> specifically how capabilities are translated from h245 to SIP.
>>
>> Can someone point to which part of the code, Asterisk or libh324M does the
>> mapping between capabilities?
>> After reviewing some relevant RFCs and specs, it is not clear to me what
>> the 1:1 mapping should be - is there any relevant documentation?
>>
>> Thanks,
>> Dan
>>
>>
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>>
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