Openser Faq

Whenever I find myself repeating the same answer, I'm posting it here. If anyone has any contributions to this list, please msg me.

OpenSER Frequently Asked Questions

Q1.

Quote:

Can OpenSER REGISTER to another SIP provider, and route traffic from local users to the provider?

A1. yes, in theory, but any provider that requires you to REGISTER with them, can be a little awkward to get working with openser. if a provider wants you to REGISTER to make calls, it expects a sip client to connect.. not a sip server like OpenSER. Furthermore you will likely be challenged when you send your INVITE's to them. There is a UAC module for openser that allows you to get round some of this, but the approach is sub-optimal (the module has limitations).

If you plan on using this for any volume of traffic, and/or expect to have multiple providers set up in this way, you should implement a SIP Back-to-Back-User-Agent (B2BUA). Often Asterisk is given as an example of a B2BUA, but many other alternatives exist[/quote] Either that or lobby your provider to work with you as a peer, rather than a client

Q2.

Quote:

How can i see how OpenSER is processing all the SIP messages

A2. You can use a command line tool like tcpdump, ngrep or tshark. These will allow you to specify protocols and ports, and will let you save the data to a file, filter the messages, or send them stdout (and much more besides). A typical command to view the messages as they arrive/leave is:

Code:

ngrep -lqtt -W byline port 5060