3cx Media / SIP Server SRTP Video Support?

[Martin_Thomas_HPA]

Hello. After a view tests i think there is no video support when the SRTP encrypted call flows through the 3cx. Like Local Lan Phone to STUN Phone call. Only Audio will be established..... If i enable only TLS without SRTP Audio and Video will be transmitted. Tomorrow i will try Local Lan to Local Lan.
I Think 3cx can answer the Question shortly.... Does 3cx Media/SIP Server support encrypted Video Connections? Or must i search for Configerrors on my Site?

Thank you

 

[VasilisV_3CX]

Hi @Martin_Thomas_HPA,

Does 3cx Media/SIP Server support encrypted Video Connections?

If both devices support the same codec, it should work. The 3CX Media server acts as a pass through and therefore isn't involved in the encryption of any video connections.

So in other words, if your devices support it and it's set up correctly the PBX should have no say in this. Also audio and video are usually handled in 2 different streams so even if SRTP is enabled on a device a second stream should be established for video using a different port and codec so SRTP should not matter. That of course depends on how devices behave.

 

[Martin_Thomas_HPA]

Ok now im not shure. I have the following setups tested:

Company LAN --- STUN Phone
Fanvil i31s ---- Fanvil x6u
SIP / RTP ---- SIP / RTP = Audio OK /Video OK
TLS /RTP ---- TLS /RTP = Audio OK / Video OK
TLS / SRTP ---- TLS /SRTP = Audio OK / NO Video
SIP / RTP ---- TLS /SRTP = Audio OK / NO Video

There is no direct IP way bitween the Phones so the RTP must flow throug 3cx. And if the Doorphone is not encrypted an tht stun phone is. Then the 3cx must encrypt the call. I can't find any special setting for this.... I will send you a log....

 

[VasilisV_3CX]

Hi @Martin_Thomas_HP,

I can't really comment on this as we've not tested this scenario you mentioned above, however from the logs, I can see that the Fanvil is not replying with video.