We used WireShark for listen the Switch between the PBX and the phone and, appear that the problem was in the mobile that receive the response in other port (5060).

Hi, i found this:

http://discussions.europe.nokia.com/t5/Connectivity/E65-to-PBX-SIP-error/m-p/373191/highlight/true#

Really, i don't know what is the "realm" (at least in spanish).

I've already posted! Thanks for help. But anyone answer there! XD

So, you recomend download other SIP client? Which would you recommend? I'll look the E72 posts...

Hi, my name is Martin and i am from Uruguay, i work in a telecommunications company which now are testing use some mobiles as PBX internals with SIP configuration. The problem that we're having is...