[Opalvoip-user] Implementing two phone lines using SIP with opal

[Keanu M. <jav...@gm...>]

Hi,

I am using opal to develop voip software for an embedded system that
supports two phone lines using SIP. With these two lines I will for
instance be able to make a call on one line, hold a call on this line
and then make a call on the second line. I also want to implement SIP
call transferring and setting up a conference between three parties.

My first question; is this possible to implement using the opalvoip library?

So far I have developed a simple voip software that implements one
phone line able to make, answer, reject, hang up and hold calls.

I have read through the documentation available as well as other
mailing threads about implementing multiple lines and my thinking/plan
is as follows. I will have a descendant of OpalManager that contains a
MixerEndPoint and SIPEndPoint. The SIPEndPoint will have two SIP
connections that maintain the control and signalling for the two
lines/calls. The mixer endpoint will mix two sink streams from the two
incoming connections and convert a source media stream to two media
streams for the two outgoing connections.

Am I on the right track with this plan and further do you have any
advice about what I am trying to do?

Kind regards

Javin Mamutil