Simple question on a Cisco/Tandberg C20 codec

Hi guys,.

I would like to ask your advice on a question, one of our customers recently raised; Here's the short story:

After that his ISP set at level a GK Radvision, customer knew no video, on its C20s, multi point conferences (video was successfully sent well).

After an initial diagnosis, the customer said that the question can be put in the C20 non acceptance/negotiation QCIF video Protocol (used in Radvision and other old stuff eventually to join the Conference).

As a solution, ISP has suggested to activate via SSH (command API) specific C20 (QCIF) Protocol (which is apparently not enabled by default... According to the ISP support)

Now, I know, C20 already supports QCIF and has to be without having to activate it via the specific shell commands!

... Besides there no reference in the documentation of the API C20 on a specific command.

What I suspect is that from time to time, an old codec ISDN connects to the Conference (perhaps as a first candidate) and somehow requires the MCU to negotiate some weird codec leading to no video (... Indeed, we saw through a troubleshooting session, conneting that theree different IP partecipants and we have not had any problems at all!).

Could you please let me know if I am mistaken and C20 accepts indeed default QCIF? ... If Yes, please could you me the command to allow it?

Thank you very much!

-Andrea

You're right C20 QCIF support in the default configuration, and no need to add a special command for him to allow.

Just for example, below is capset(2) terminal of C20 redefining this as video can be receive and including QCIF with multiple video Protocol.

================================================================

BEGINNING of incoming MESSAGE H245LO-1

capabilityTableEntryNumber 12,

capacity receiveVideoCapability: h263VideoCapability:

{

qcifMPI 1,.<== support="" for="" decoding="" qcif="" for="">

cifMPI 1,.

cif4MPI 1,.

maxBitRate 20000,

unrestrictedVector FALSE,

arithmeticCoding FALSE,

advancedPrediction FALSE,

pbFrames FALSE,

temporalSpatialTradeOffCapability FALSE,

errorCompensation FALSE,

h263Options

{

capabilityTableEntryNumber 14,

capacity receiveVideoCapability: h261VideoCapability:

{

qcifMPI 1,.<== support="" for="" decoding="" qcif="" for="">

cifMPI 1,.

temporalSpatialTradeOffCapability FALSE,

maxBitRate 19200,

stillImageTransmission TRUE

capabilityTableEntryNumber 18,

capacity receiveVideoCapability: extendedVideoCapability:

h263VideoCapability:

{

qcifMPI 1,.<== support="" for="" decoding="" qcif="" for="">

cifMPI 1,.

cif4MPI 1,.

maxBitRate 20000,

unrestrictedVector FALSE,

arithmeticCoding FALSE,

advancedPrediction FALSE,

pbFrames FALSE,

temporalSpatialTradeOffCapability FALSE,

errorCompensation FALSE

================================================================

Although using QCIF with C20 is little lose capacity C20 power video treatment, but interesting to understand why the software upgrade of Radvision GK introduce one-way video problem.

Application of C20 log will definitely help to identify or at least limit the first cause of this.

Tags: Cisco Support

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