Call Hold And Retrieve; Call Transfer; Fax And Modem Settings - AudioCodes MediaPack MP-402 User Manual

SIP User's Manual
Call Forward (3xx Redirect Responses); refer to '
Call Waiting (182 Queued Response); refer to '
The above services are permanently active and cannot be disabled.
For example setups of Supplementary Services, refer to Section '
Supplementary

1.4.3.1.1 Call Hold and Retrieve

Call Hold and Retrieve can be initiated by using the corresponding features of the ISDN
Phone.
Hold is performed by sending a REINVITE with the IP address 0.0.0.0 and 'a=inactive' in
the SDP.
The ISDN user can retrieve the call using the appropriate features of the ISDN phone.

1.4.3.1.2 Call Transfer

The system supports call transfer by the SIP side. The system supports the following two
types of call transfers:
Consultation Transfer (Refer and Replaces)
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 and Party C = transferred to.
•
A Calls B.
•
B answers.
•
A holds the call and dials a call to C.
•
A connects B to C, and then A disconnects.
•
After the transfer is complete, the B and C parties engage in a call.
Blind Transfer (Refer)
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. It can do so by sending a
REFER message.
The result of the transfer is a call between B and C (similar to consultation transfer,
but skipping the consultation stage).
1.4.3.1.3 Call Forward
The gateway supports call forward using 3xx responses. If the gateway receives a 3xx
response to an invite, the call is forwarded to the new destination.
1.4.3.1.4 Call Waiting
The gateway supports Call Waiting using the SIP Queued message. If a Queued message
is received, the gateway plays the Queued tone to the ISDN phone.

1.4.3.2 Fax and Modem Settings

Fax and modem settings are described in '
Version 2.4
Services' on page 1 49'.
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C all Forward'
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C all Waiting'
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C onfiguring Fax and
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17
1. Overview
on page 1 7.
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on page 1 7.
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C onfiguring
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Modem' on page 1 44.
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June 2008