User`s manual

MediaPack SIP
MediaPack SIP User’s Manual 170 Document #: LTRT-65405
• While hearing dial tone, or when dialing to the new destination (before dialing is complete)
the user can retrieve the held call by pressing hook-flash.
• The held call can’t be retrieved while Ringback tone is heard.
• After the consultation call is connected, the user can switch between the held and active call
by pressing hook-flash.
8.1.3 Call Transfer
There are two types of call transfers:
• Consultation Transfer (Refer + Replaces)
• Blind Transfer (Refer)
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.
• A Calls B.
• B answers.
• A presses the hook-flash and puts B on-hold (party B hears a hold tone)
• A dials C.
• After A completed dialing C, he can perform the transfer by onhook the A phone.
• 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:
a. Just after completing dialing C phone number - Transfer from setup.
b. While hearing Ringback – Transfer from alert.
c. While speaking to C – Transfer from active.
Blind transfer is performed after we have a call between A and B, and party A 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).
Note the following SIP issues:
• Transfer is initiated by sending Refer with Replaces.
• The gateway can receive and act upon receiving Refer with or without Replaces.
• The gateway can receive and act upon receiving INVITE with Replaces, in which case the
old call is replaced by the new one.
• The INVITE with Replaces can be used to implement Directed Call Pickup.
8.1.4 Call Forward
Five forms of call forward are supported:
1. Immediate - Any incoming call is forwarded immediately and unconditionally.
2. Busy - Incoming call is forwarded if the endpoint is busy.
3. No reply -The incoming call is forwarded if it isn't answered for a specified time.
4. On busy or No reply - Forward incoming calls when the port is busy or when calls are not
answered after a configurable period of time.