Hi All.<br>
<br>
I've got a question about handling REFER messages. Below is a REFER
message that my Grandstream GXP2000 phone generated when I transferred
a call to another SIP phone on the same SER proxy.<br>
<br>
The problem is that SER did a lookup('location') and couldn't find the
phone number in the subscriber table, so it routed the message to the
PSTN gateway.<br>
<br>
SER should have looked at the Refer-To header to get the actual destination of the message.<br>
<br>
How can I get SER to handle this message correctly? Should REFER
messages hit the lookup('location') function in my ser.cfg script?<br>
<br>
NOTE: my SER proxy sits behind a Cisco 3600 so the ALG functionality
has altered the IP. The message shows my SER server as IP address
<a href="http://10.3.0.221">10.3.0.221</a><br>
<br>
Regards,<br>
Paul<br>
<br>
U 2005/06/01 14:22:24.073518 <a href="http://66.90.46.29:5060">66.90.46.29:5060</a> -> <a href="http://10.3.0.221:5060">10.3.0.221:5060</a><br>
REFER sip:4075552279@66.243.109.99:5060 SIP/2.0.<br>
Via: SIP/2.0/UDP <a href="http://172.31.130.139">172.31.130.139</a>;branch=z9hG4bK09ff837994d9e898.<br>
Route: <sip:4075552279@10.3.0.221:5060;nat=yes;ftag=204ed7cd9666ebba;lr>.<br>
Route: <sip:<a href="http://216.229.127.60:5060">216.229.127.60:5060</a>;lr>.<br>
From: 3212514238 <sip:3212514238@66.243.109.99:5060>;tag=204ed7cd9666ebba.<br>
To: <a href="mailto:sip:4075552279@66.236.245.100">sip:4075552279@66.236.245.100</a>;tag=EB25EC-B85.<br>
Contact: <<a href="mailto:sip:3212514238@172.31.130.139">sip:3212514238@172.31.130.139</a>>.<br>
Supported: replaces.<br>
Refer-To: <<a href="mailto:sip:3212814820@sip.mycompany.com">sip:3212814820@sip.mycompany.com</a>>.<br>
Referred-By: <<a href="mailto:sip:3212514238@172.31.130.139">sip:3212514238@172.31.130.139</a>>.<br>
Call-ID: <a href="mailto:13195134-3326638548-685571@66.243.109.99">13195134-3326638548-685571@66.243.109.99</a>.<br>
CSeq: 51906 REFER.<br>
User-Agent: Grandstream GXP2000 <a href="http://1.0.1.8">1.0.1.8</a>.<br>
Max-Forwards: 70.<br>
Allow: INVITE,ACK,CANCEL,BYE,NOTIFY,REFER,OPTIONS,INFO,SUBSCRIBE,UPDATE,PRACK.<br>
Content-Length: 0.<br>
<br>