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SIP Training

Hello all, It has become obvious that I need to learn more about SIP and how to configure/troubleshoot SIP trunks in a Cisco environment. Can you all suggest some resources that I can use. Are there any good classes out there?

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VIP Purple

SIP Training

I'm not aware of any class (but probably there are some as the topic is not that uncommon). On CiscoLive I once attended a SIP-Techtorial which was great. (If you have the possibility to attend).

And CiscoPress has a book on that topic:

http://www.ciscopress.com/store/sip-trunking-9781587059445

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SIP Training

I've got that book. Not overly impressed with it. A large amount of it is high-level (project) management stuff. The technical bits in the middle are more about CUBE.

There didn't seem to be much detail about basic, low-level SIP messaging (e.g. call setup, disconnect, transfer/diverts, media setup, codec selection, authentication, etc). I've managed to pick up some information just by reading Wireshark traces from calls made in a controlled environment. I still haven't managed to fully understand mid-call DTMF SIP messages. CUCM seems to do weird stuff there....

The problem with SIP, I found, is that it's too variable. I remember looking into some of the RFCs and realised that there are often two or three different RFCs for the same feature.

"The wonderful thing about standards is that there are so many to choose from."

GTG

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