VP-12, VP-12P IP phones. Operation manual
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specified in the 'Allow' header, the session update is performed by periodic transmission of UPDATE
messages).
•
Min SE, s
– minimal time interval for connection health checks (90 to 1800s, 120s by default).
•
Session Expires, s
– period of time in seconds that should pass before the forced session termination if
the session is not renewed in time (90 to 80000s, recommended value—1800s, 0—unlimited session).
•
Keepalive NAT Sessions Mode
– select SIP server polling method:
•
Off
– SIP server will not be polled;
•
Options
– SIP server polling with OPTIONS message;
•
Notify
– SIP server polling with NOTIFY message;
•
CLRF
– SIP server polling with an empty UDP packet.
•
Keepalive Timeout, s
– SIP server polling time period, in seconds.
•
Use Alert-Info Header
– process INVITE request
'Alert-Info'
header to send a non-standard ringing to the
subscriber port.
•
Check RURI User Part Only
– when selected, only subscriber number (user) will be analyzed, and if the
number matches, the call will be assigned to the subscriber port. When unselected, all URI elements
(user, host and port—subscriber number, IP address and UDP/TCP port) will be analyzed upon receiving
an incoming call. If all URI elements match, the call will be assigned to the subscriber port.
•
Send IP Address in Call ID Header
– when selected, during outgoing communications, device custom IP
address will be used in 'Call-ID' header in 'localid@host' format.
