Hi,<br><br>I'm trying to troubleshoot and incoming call from SBC to CCM SIP trunk. Outgoing call to SBC from IP Phone works fine. using G711ulaw codec without security.<br><br>Topology:<br>SIP server ------------SBC(SIP)---------CCM7-----IP Phone(SCCP)<br>
<br>Problem<br>I'm getting 400 Bad request from Sniffer trace. I checked my Partition and CSS including transformation mask and saw no problem.<br>We are using UDP for sip protocol. <br><br>Q.<br>Any idea why CCM7 is sending 400 Bad request? There seem to be a reason CCM7 is rejecting the SIP invite however i could not find it.<br>
<br>Attached is the captured sniffer trace on CCM.<br><br>Thanks in advance for the help.<br><br>regards,<br>Jeff<br><br><br><br><br><br><br>