[Asterisk-video] capability translation from h245 to SIP

[Sergio Garcia Murillo]

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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