I have 2 sip phones and an analog phone attached to a Digium USB fxs
device. I would like the analog phone to ring when transfers are made
to it, but I don't want it to ring when a call comes in from outside,
although I would like the person at that phone to be able to pick up the
phone and answer
yes, write the correct dialplan, like
[inbound]
arrives a call,
answer
ring sip phones
[local]
exten 200 dial sip1
exten 201 dial sip2
exten 202 dial zap1
so you will be able to pick up from analog the sip ringing
phone with *8 and when you answer from sip, you'll be able
to transfer the call to