DVG-6008G VoIP Gateway User Manual
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D-Link Corporation
60
Session timer Interval
The initial INVITE request establishes the duration of the session and may include a
Session-Expires header and a Min-SE header. These headers indicate the session
timer value required by the user agent (UAC).A receiving user agent server (UAS) or
proxy can lower the session timer value, but not lower than the value of the Min-SE
header. If the session timer duration is lower than the configured minimum, the proxy
or UAS can also send out a 422 response message. If the UAS or proxy finds that the
session timer value is acceptable, it copies the Session-Expires header into the 2xx
class response.
A UAS or proxy can insert a Session-Expires header in the INVITE if the UAC did not
include one. Thus a UAC can receive a Session-Expires header in a response even if
none was present in the request.Its value range from 90-60000s.
Session Timer Refresher
It specifies refresher which including in SIP message body, user agent client (UAC) or
user agent server (UAS).
UPDATE sips:[email protected] SIP/2.0
Via: SIP/2.0 pc33.atlanta.example.com;branch=z9hG4bKnashds12
Route: sips:p1.atlanta.example.com;lr
Supported: timer
Session-Expires: 4000;refresher=uac
Max-Forwards: 70
To: Bob <sips:[email protected]>;tag=9as888nd
From: Alice <sips:[email protected]>;tag=1928301774
Call-ID: a84b4c76e66710
CSeq: 314162 UPDATE
Contact: <sips:[email protected]>
Configuring GSM-SIP Mapping Code
This part specifies response codes between GSM cause reasonand SIP response code.