[Serusers] Asterisk Registering with SER question

Hi, I've been registering asterisk to ser. I'm using SER as the outbound SIP trunk for Asterisk. Users registered with Asterisk will use the SIP trunk to reach SER registered users and PSTN's. Now when I register Asterisk with SER, on my SER's location table I see these record: Username Column = asterisk Contact Column = sip:s@202.84.24.47 I have a script running that checks the accounting records and sends BYE for the username that has no credit left. I found it hard doing this because of the record on the Contact column on location table of SER, everytime asterisk registers with SER. I could not send BYE to asterisk because of the broken contact information on Contact column of SER's location table. How can I correct this? Here is my sip.conf configuration: [general] port = 5060 bindaddr = x.x.x.x context = sip disallow=all allow=ulaw allow=alow fromuser=asterisk secret=test123 realm=mydomain.com register=>asterisk:test123@mydomain.com Thanks in advance, Ryan