Call Features
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The following table lists the parameters you can use to configure multiple call appearances.
phone_setting.call_appearance.calls_per_linekey
It configures the maximum number of concurrent calls per line key for all registered
lines.
If it is set to 0, there is no limit for the number of concurrent calls.
Example:
phone_setting.call_appearance.calls_per_linekey = 2
It means that you can have up to two concurrent calls per line key on the IP phone.
Note: The value configured by the parameter
“account.X.phone_setting.call_appearance.calls_per_linekey” takes precedence over
that configured by this parameter. It is not applicable to T19(P) E2 IP phones.
account.X.phone_setting.call_appearance.calls_per_linekey
[1]
It configures the maximum number of concurrent calls per line key for a specific line.
If it is set to 0, there is no limit for the number of concurrent calls.
Example:
account.1.phone_setting.call_appearance.calls_per_linekey = 2
It means that you can have up to two concurrent calls per line key associated with
account 1.
Note: The value configured by this parameter takes precedence over that configured
by the parameter “phone_setting.call_appearance.calls_per_linekey”. It is not
applicable to T19(P) E2 IP phones.
[1]
X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for
T41P/T41S/T27P/T27G, X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2.
Call Hold
Call hold provides a service of placing an active call on hold. It enables you to pause activity on an active
call so that you can use the phone for another task, for example, to place or receive another call.
When a call is placed on hold, the IP 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. IP phones support two call
hold methods, one is RFC 3264, which sets the “a” (media attribute) in the SDP to sendonly, recvonly or
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