The Sip Smell Of Success

(I’m running out of bad puns. Send help.)

I finally got sound between my Packet8 DTA310 and Asterisk (or more specifically, to Sipset running on my laptop)! It is the first time I’ve gotten any audio from the DTA310 to anything else since I dropped Packet8 service. Not to give you the wrong idea, I have to tell you that I only got audio one way: from my laptop back to the DTA310. There was nothing but silence in the phone plugged into the DTA310.

I changed so many parameters around during my testing that I have no idea what got me as far as I got. My thought is that the DTA310 uses a narrower range of RTP ports than I’ve got defined, and I got lucky by hitting upon the right port at the right time. I did manage to capture packets from some attempts, so perhaps I can find a pattern.

Another thought is that the DTA310 isn’t designed for reinviting. That is, it expects to always talk to the SIP server and not interface directly with other SIP UAs. That seems to be the way it works with the Packet8 service, so it’s plausable that the DTA310 has this limitation.

More experimenting is in order, but it seems I’m getting closer!