3Com VCX V7122, User Manual

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V7122 GatewayUser Guide
Call Transfer
There are two types of call transfers:
ƒ Consultation Transfer
ƒ Blind Transfer
The common way to perform a consultation transfer is as follows:
In the transfer scenario there are three parties:
Party A - transferring, Party B – transferred, Party C – transferred to.
ƒ A Calls B.
ƒ B answers.
ƒ A presses the hookflash and puts B on-hold (party B hears a hold tone)
ƒ A dials C.
ƒ After A completed dialing C, A can perform the transfer by on-hooking the A phone.
ƒ After the transfer is completed, B and C parties are engaged in a call.
The transfer can be initiated at any of the following stages of the call between A to C:
ƒ Just after completing dialing C phone number - Transfer from setup.
ƒ While hearing ring back – Transfer from alert.
ƒ While speaking to C – Transfer from active.
Blind transfer is performed after we have a call between A and B, and A party decides to
transfer the call to C immediately without speaking with C.
The result of the transfer is a call between B and C (just like consultation transfer only
skipping the consultation stage).
The gateway doesn't initiate call transfer, it only can respond to call transfer request.
Configuring the DTMF Transport Types
You can control the way DTMF digits are transported over the IP network to the remote
endpoint. The following five modes are supported:
ƒ
Using NOTIFY messages according to <draft-mahy-sipping-signaled-digits-01.txt>:
In this mode, DTMF digits are carried to the remote side using NOTIFY messages.
To enable this mode set: