I replaced my — not very good — imported VOIP handset with a Snom 360. Conveniently, the Asterisk sip.conf has a loose default user for SNOM defined, but it’s not perfect, and certainly didn’t let me use the SNOM and voicemail properly.

Firstly, the DTMF mode must be rfc2833, and not inband as indicated. Inband meant that called parties (e.g. voicemail applications, IVRs) can’t “hear” the dtmf even though you can on the snom..

Secondly, the Message Waiting Indicator settings – to make them work you need both a ‘mailbox’ entry, and there must have been a voicemail left in the box to create it. If the box has never had a message before, you will see 404 messages bursting through your sip debug screens in Asterisk.

When you get it all working, it looks a bit like the image, including a voicemail count. The MWI actually flashes.

To make the VM retrieve button work, you need a vmexten=xx line in your sip.conf. The following config works with Asterisk 1.4 and the SNOM 360.

[andysnom]
type=friend
context=default
secret=heregoesthepassword
host=dynamic
dtmfmode=rfc2833
username=andysnom
mailbox=1001
vmexten=500
disallow=all
allow=ulaw
regexten=1001

Going to enjoy playing with the other features on this phone..