Bob Long, A friend of mine and fellow Cisco instructor at Global Knowledge recently wrote a pretty good whitepaper on SIP trunking with the UC500.

Glad I found this site and think it is great! Kudos.

Thought I would give back a little to a community that has helped so much with a lot of CME and UC500 questions I've had. Here's an issue I ran into with the new 3911 and CME.

I'm trying to setup uc520 to work with my Vonage softphone account. I've configured sip-ua to registrater ok and incoming calls work - but I can't make outbound calls.

Does anyone have any informaiton on connecting Avaya IP Office 4.1 to a CCME using VoIP Trunks.
Avaya can support H.323 or SIP.
Thanks for your Help.

I have an installation where there are 2 PoTs lines and a SIP connection.

After seeing a few posts on the site regarding ITSPs I decided to bite the bullet and try one out.  I chose nexVoterx at random and must say I was impressed.  They had a very automated se

TonyH a Technical Marketing Engineer for CME at Cisco passed along the attached document on how to configure Call Manager Express to use SIP phones. What a great resource! Thanks Tony.

CIsco has made a CHEAP phone. Ok, not cheap lets use the word inexpensive. 

The Cisco Unified SIP Phone 3911 is a SIP only single line phone. Most likely good for lobbies and medium use installs.   It will work with Call Manager Express and the UC500 series.  You just have to know how to configure SIP phones on

Below I've moved a few comments regarding SIP Providers from other areas of the Site.

Please feel free to comment.

In working with the UC520 and using the configuration tool, I think I found a bug.