WG3100-Series GSM VoIP Gateway User Manual
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Techroutes Network Pvt. Ltd.
56
From Mode when Caller ID Is Unavailable
Used to configure "From" Mode when Caller ID Is Unavailable
Anonymous : From: <sip: Anonymous @host.com>;tag=51088abb
Username :
From: <sip: Username @host.com>;tag=51088abb
Answer Mode
Answered: Gateway will send SIP message "200 OK" to SIP Server after GSM/CDMA users answered the call.
Alerted: Gateway will send SIP message ‘200 OK’ to SIP Server immediately after 183 Ringing. In this situation, the called
party possibly still in ringing status.
183 Mode
Immediately: Gateway will send "183 RING" immediately to SIP Server while it receive “INVITE". In this situation, the
called party possibly still not in ringing status.
Alerted: Gateway will send "183 RING" after received exact ringing signal from GSM/CDMA network. In this situation, the
called party is definitely in ringing status.
Session Timer
SIP Session Timers which is an extension of SIP RFC 4028 that allows a periodic refreshing of a SIP session using the
RE-INVITE/UPDATE message. The refreshing allows both the user agent and proxy to determine if the SIP session is still
active. The SIP Session Timer is a keep alive mechanism for SIP sessions that allow User Agents (UA) or proxies to determine
the status of a session and to release it if it is not active, even if a BYE has not been received.
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.
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