Call Features
199
When a call is placed on hold, the phones send an INVITE request with HOLD SDP to request remote parties to
stop sending media and to inform them that they are being held. The phones support two call hold methods, one is
, which sets the “a” (media attribute) in the SDP to sendonly, recvonly or inactive (for example, a=se-
endonly). The other is
, which sets the “c” (connection addresses for the media streams) in the SDP to
zero (for example, c=0.0.0.0).
Topic
Call Hold Configuration
The following table lists the parameters you can use to configure call hold.
Parameter
sip.rfc2543_hold
<y0000000000xx>.cfg
Description
It enables or disables the phone to use RFC 2543 (c=0.0.0.0) outgoing hold signaling.
Permitted
Values
0
-Disabled, SDP media direction attributes (such as a=sendonly) per RFC 3264 is used when placing
a call on hold.
1
-Enabled, SDP media connection address c=0.0.0.0 per RFC 2543 is used when placing a call on
hold.
Default
0
Web UI
Features > General Information > RFC 2543 Hold
Parameter
account.X.hold_use_inactive
[1]
<MAC>.cfg
Description
It enables or disables the phone to use inactive outgoing hold signaling.
Note
: It works only if “sip.rfc2543_hold" is set to 0 (Disabled).
Permitted
Values
0
-Disabled, SDP media direction attribute “a=sendonly” is used when placing a call on hold.
1
-Enabled, SDP media direction attribute “a=inactive” is used when placing a call on hold. RTP pack-
ets will not be sent or received.
Default
0
[1]
X is the account ID. X=1-100.
Call Forward
You can forward calls in special situations, such as when the phone is busy or there is no answer, or forwarding all
incoming calls to a contact immediately.
Topics
Call Forward Settings Configuration
Call Forward Feature Configuration
Call Forward Synchronization for Server-side Configuration
Call Forward Settings Configuration
You can change the following call forward settings:
l
Enable or disable the call forward feature. If disabled, the users have no permission to configure call forward on
their phone.
l
Allow or disallow users to forward an incoming call to an international telephone number (the prefix is 00).
l
Enable or disable the display of the Diversion header. The Diversion header allows the phone which receives a
forwarded-call to indicate where the call was from.
The following table lists the parameters you can use to change the call forward settings.