Two days ago we began to experience isolated issues with select inbound calls 
from our local calling area. The callers either can not be heard, or the 
inbound calls do not get delivered properly. I alerted our ITSP (Bandwidth.com) 
about these issues and they provided the following response earlier...

Your 200 ok is coming back with a contact field that the carrier cannot 
interpret.  The ~ are an incorrect character that they cannot interpret. 

U 2010/12/09 16:28:39.885329 67.78.140.8:5060 -> 216.82.224.202:5060 SIP/2.0 
200 OK. Record-Route: <sip:216.82.224.202;lr;ftag=VPSF506071629460>. 
Record-Route: <sip:67.231.8.93;lr=on;ftag=VPSF506071629460>. Via: SIP/2.0/UDP 
216.82.224.202;branch=z9hG4bKf4cc.cb324f72.0. Via: SIP/2.0/UDP 
67.231.8.93;branch=z9hG4bKf4cc.63a920f2.0. Via: SIP/2.0/UDP 
4.68.250.148:5060;branch=z9hG4bK506071629460-1257211244938. From: "ADVANCE 
TECHNOL" < sip:[email protected] >;tag=VPSF506071629460. To: < 
sip:[email protected]:5060 >;tag=776224666. Call-ID: 
[email protected]. CSeq: 1 INVITE. Server: 
sipXecs/4.2.0 sipXecs/sipxbridge (Linux). Contact: 
<sip:[email protected]:5080;transport=udp>.

No changes have been made to the SipX server that I am aware of, and I have 
checked the configs and do not see any areas where these issues"~" characters 
are intentionally set. I have also rebooted the SipX Server and the internet 
firewall which handles the call traffic but we are still experiencing the same 
problems. It is just land line calls from our local call area as other regional 
and long distance call, as well as all cellular incoming calls work fine and 
there have been no issues with outbound calling even to the local area.

Can anyone offer insight as to what could be causing these issues, or other 
areas to checkout?

Regards,

Warren K. Wiemer

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