AudioCodes Mediant 800 MSBG - Working with Supplementary Services

Version 6.2 453 February 2011
SIP User's Manual 8. IP Telephony Capabilities
8.3.8 Working with Supplementary Services
The device supports the following supplementary services:
 Call Hold and Retrieve (see ''Call Hold and Retrieve'' on page 453)
 BRI su
spend-resume (see BRI Suspend and Resume on page 455)
 Con
sultation (see Consultation Feature on page 455)
 Call Tran
sfer (see ''Call Transfer'' on page 456)
 Call Fo
rward (see ''Call Forward'' on page 457)
 Call Waiting (see
Call Waiting on page 460)
 Messag
e Waiting Indication (see ''Message Waiting Indication'' on page 461)
 Calle
r ID (see Caller ID on page 463)
 Thre
e-way conferencing (see Three-Way Conferencing on page 465)
 Multilevel Pre
cedence and Preemption (see ''Multilevel Precedence and Preemption''
on page 467)
To activate these
supplementary services, enable each service’s corresponding parameter
using the Web interface or ini file.
Notes:
• All call participants must support the specific supplementary service that
is used.
• When working with certain application servers (such as BroadSoft’s
BroadWorks) in client server mode (the application server controls all
supplementary services and keypad features by itself), the device's
supplementary services must be disabled.
8.3.8.1 Call Hold and Retrieve
Initiating Call Hold and Retrieve:
 Active calls can be put on-hold by pressing the phone's hook-flash button.
 The party that initiates the hold is called the holding party; the other party is called the
held party.
 After a successful Hold, the holding party hears a Dial tone (HELD_TONE defined in
the device's Call Progress Tones file).
 Call retrieve can be performed only by the holding party while the call is held and
active.
 The holding party performs the retrieve by pressing the telephone's hook-flash button.
 After a successful retrieve, the voice is connected again.
 Hold is performed by sending a Re-INVITE message with IP address 0.0.0.0 or
a=sendonly in the SDP according to the parameter HoldFormat.
 The hold and retrieve functionalities are implemented by Re-INVITE messages. The