Norstar Version - IP Office Info

VOIP Parameters
· Compression Mode: Default = Automatic Selection
This defines the type of compression which is to be used for calls on this line.
· Call Initiation Timeout: Default = 4 seconds.
Sets how long to wait for successful connection before treating the line as busy.
· DTMF Support: Default = RFC2833
This setting is used to select the method by which DTMF key presses are signaled to the remote end. The
supported options are In Band, RFC2833 or Info.
· Registration Expiry: Default = 60 minutes.
This setting defines how often registration with the SIP ITSP is renewed following any previous registration.
· VOIP Silence Suppression: Default = Off
When selected, this option will detect periods of silence on any call over the line and will not send any data during
those silent periods.
· RE-Invite Supported: Default = Off.
When enabled, Re-Invite can be used during a session to change the characteristics of the session, for example
when the target of an incoming call or a transfer does not support the codec originally negotiated on the trunk.
Requires the ITSP to also support Re-Invite.
· Use Offerer's Codec: Default = Off.
Normally for SIP calls, the answerer's codec preference is used. This option can be used to override that behavior
and use the codec preferences offered by the caller.
· Refer Support: Default = On, Software level = 7.0+
REFER is the method used by many SIP devices, including SIP trunks, to transfer calls. These settings can be used
to control whether REFER is used as the method to transfer calls on this SIP trunk to another call on the same
trunk. If supported, once the transfer has been completed, the IP Office system is no longer involved in the call. If
not supported, the transfer may still be completed but the call will continue to be routed via the IP Office.
· Incoming: Default = Auto
Select whether REFER can or should be used when an attempt to transfer an incoming call on the trunk results
in an outgoing call on another channel on the same trunk. The options are:
· Always
Always use REFER for call transfers that use this trunk for both legs of the transfer. If REFER is not
supported, the call transfer attempt is stopped.
· Auto
Request to use REFER if possible for call transfers that use this trunk for both legs of the transfer. If REFER
is not supported, transfer the call via the system as for the Never setting below.
· Never
Do not use REFER for call transfers that use this trunk for both legs of the transfer. The transfer can be
completed but will use 2 channels on the trunk.
· Outgoing: Default = Auto
Select whether REFER can or should be used when attempt to transfer an outgoing call on the trunk results in
an incoming call on another channel on the same trunk. This uses system resources and may incur costs for
the duration of the transferred call. The options available are the same as for the Incoming setting.
Norstar Version 7.0 Manager Page 96
IP Office Essential Edition
- Issue 03a (21 February 2011)