Question:When does the N510 sends Registration request with expires = 0. This means a SIP de-registration. Answer:There are different scenarios that an N510 sends a de-registration request. - Web-interface: Uncheck "Active" option for this SIP account
- Web-interface: Delete SIP account.
- Device expects SIP values are no longer valid:
address of record ( "displayname"<sip:user-id@domain.net> ) contact addresses ( e.g. user-id@97.98.96.1:53260 ) on the registration server (location database)
De-registration is started with possible new registration So initiations for de-register procedures are: - address-of-record was modified ( displayname, user-id, login-id, domain )
- contact address might have changed:
- new local sip port
- new local IP address
- new public IP address (detected by STUN) (checked any 240s, configurable)
- new public port ( not checked periodically )
Possible solution:Disable / delete the STUN settings in the device. Upgrade device to software >211 because of STUN improvement to avoid these issues. |