Hi,

I try to get encrypted stream (SRTP) for my single step conference. how can I do that ?

to establish single step, when a call is started

1- I get device ID of extension x1. x1 is used by agent
2- when I get call start, I get deviceid for another extension, let say extension x2
2- I register terminal of extension x2. sending RegisterTerminalRequest for extension x2. I also specify RTP receiver, IP and port
3- I send single step conference request. send SingleStepConferenceCall, with the call ID + x1's device ID + x2's device ID

and, RTP stream is started. But, this stream is unencrypted (I checked with wireshark).

later on, I configured Avaya to make streams encrypted. Then, I checked stream between DMCC - x1. And, it is encrypted. But, stream between DMCC - x2 (terminal extension) is still not encrypted.

As I see, there is a parameter in RegisterTerminalRequest. It is called "encryption" , and explanation is: "Specifies a list of encryption algorithms supported for media (RTP). Possible values include MediaConstants.AES ("aes") and/or MediaConstants.NOENCRYPTION ("none"). This encryption list specifies the capabilities of the CMAPI endpoint. The actual algorithm that is chosen for a call is dependent on the administered list in Communication Manager. Administration of Media Encryption is done in the Communication Manager ip-codec-set form."

I set this value to "aes", and send RegisterTerminalRequest. It is completed successfully, and I get RegisterTerminalResponse. But, when I call same single step conference request, it gives "generic" error.

Is there anyone who knows what I should do? Should I send a different SingleStepConferenceCall ? because I only send activeCall, deviceToJoin, participationType.

or, should I configure something else in DMCC ?

You should check the configuration of your Communication Manager. It seems that the IP Cpdec Set being used by the DMCC terminal does not allow "aes" encryption.

Martin

Thanks a lot Martin. We found the problem. Problem was improper configuration betweens network region.

Now, I register an extension as terminal. I send SingleStepConfere request, and I get encrypted RTP stream from terminal extension. But, I dont get SRTP key. Where can I find key of SRTP stream ?

I was expecting I would get it from DMCC messages, but I dont. Do you know where is this key ?

All the encryption parameters are in the MediaStart event.