VTech ET685 Administrator And Provisioning Manual page 155

Setting
SIP:
Network identity (port)
SIP T1 (ms)
Timer Support
(RFC4028)
SIP Session Timer (s)
Web User Interface (WebUI) Reference
ET685 Administrator and Provisioning Manual
Description
Set a static local port number, which is used to listen for SIP
protocol communications. Please note that setting the value
to 5060 also enables direct IP calls to the IP identity (see
also sip_ip_dialin_content_types).
Set the retry timer in milliseconds after which an
unanswered request is resent. If it is set to 500, the phone
will resend the unanswered request after 500, 1000, 2000,
4000, 6000 ... 31500 ms. If the request is still unanswered
after this procedure, an error message will be shown on the
display.
Define whether sip-stack should support usage of timers.
(includes adding headers Session-Expires and Min-SE)
If SIP Session Timer Support is enabled, this option
specifies the SIP session timer in seconds. For instance, a
Re-INVITE will be sent after 50% of its value has elapsed.
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