[OpenSER-Users] Set up two SIP to PSTN calls and then connect them

[Andreas Granig]

> To my knowledge, it’s not possible to use OpenSER alone to do this. 
> Options include WeSIP (beta software, restrictive licence) or Asterisk 
> (poor implementation of “peer” identification limits usability). Could 
> anyone advise what other alternatives there are? Is it possible to just 
> use OpenSER? What about SEMS?

In the source tree, there is "examples/ctd.sh", which relies on the help 
of the involved UACs (using REFER).
For just INVITE, SEMS is a good choice, and we plan to submit our 
click2dial plugin into the trunk within the next days.

Andreas