Welltech WG2504 FXS V.4.02 - Manual (Page 38)

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CH5 VOIP Advance
5-1 SIP
Figure 5-1 SIP
Parameter Description:
 SIP Hold Type: SIP on hold message sending method.
- Send Only: Set the SDP media to sendonly when send an on-hold
SIP message.
- 0.0.0.0: Set the SDP connection to 0.0.0.0 when send an on-hold
SIP message.
- Inactive: Set the SDP media to inactive when send an on-hold SIP
message.
 SIP Compact Form: Enable SIP compact form or not. When enable
this feature, the connected SIP proxy is required to support compact
form.
 Session Refresher: Who will send dialog keep alive message
(re-invite or update).
 UAC: User Agent Client will do the refresh (default setting)
 UAS: User Agent Server will do the refresh
 SIP T1 (msec): T1 determines several timers as defined in
RFC3261. For example, when an unreliable transport protocol is
used, a Client Invite transaction retransmits requests at an interval
that start at T1 seconds and doubles after every retransmission. A