Yealink SIP-T27P [300/841] Diversion history info

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones

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Call forward allows users to redirect an incoming call to a third party. IP phones redirect

an incoming INVITE message by responding with a 302 Moved Temporarily message,

which contains a Contact header with a new URI that should be tried. Three types of call

forward:

 Always Forward -- Forward the incoming call immediately.

 Busy Forward -- Forward the incoming call when the IP phone or the specified

account is busy.

 No Answer Forward -- Forward the incoming call after a period of ring time.

Call forward can be configured on a phone or a per-line basis depending on the call

forward mode. The following describes the call forward modes:

 Phone (default): Call forward feature is effective for the IP phone.

 Custom: Call forward feature can be configured for each or all accounts.

The server-side call forward settings disable the local call forward settings. If the

server-side call forward feature is enabled on any of the IP phone’s registrations, the

other registrations are not affected. DND activated on the IP phone disables the local no

answer forward settings.

The call forward on code and call forward off code configured on IP phones are used to

activate/deactivate the server-side call forward feature. They may vary on different

servers.

Diversion/History-Info

IP phones support the redirected call information sent by the SIP server with Diversion

header, per draft-levy-sip-diversion-08, or History-info header, per RFC 4244. The

Diversion/History-info header is used to inform the IP phone of a call’s history. For

example, when a phone has been set to enable call forward, the Diversion/History-info

header allows the receiving phone to indicate who the call was from, and from which

phone number it was forwarded.

Forward International

Forward international allows users to forward an incoming call to an international

telephone number. This feature is enabled by default.

Forward Emergency

Forward emergency allows the incoming calls from some authorized numbers not to be

forwarded when the call forward feature is enabled. The incoming call will not be

logged in the Forwarded Calls list. This feature is disabled by default.