User`s manual

MediaPack SIP User’s Manual 8. Telephony Capabilities
Version 4.6 169 June 2005
8 Telephony Capabilities
8.1 Working with Supplementary Services
The MediaPack SIP FXS and FXO gateways support the following supplementary services:
• Hold / Retrieve; refer to Section
8.1.1.
• Consultation / Alternate; refer to Section
8.1.2.
• Transfer (Refer + Replaces); refer to Section
8.1.3.
• Call Forward (3xx Redirect Responses); refer to Section
8.1.4.
• Call Waiting (182 Queued Response); refer to Section
8.1.5.
• Message Waiting Indication (MWI); refer to Section
8.1.6.
To activate these supplementary services (Hold, Transfer, Forward, Waiting and MWI) on the
MediaPack gateway, enable each service’s corresponding parameter either from the Web
Interface or via the ini file. Note that all call participants must support the specific used method.
Note: When working with application servers (such as BroadSoft’s BroadWorks) in
client server mode (the application server controls all supplementary
services and keypad features by itself), the gateway’s supplementary
services must be disabled.
8.1.1 Call Hold and Retrieve
8.1.1.1 Initiating Hold/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.
• 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 hook-flash.
• After a successful retrieve, voice is connected again.
• Hold is performed by sending a REINVITE with the IP address 0.0.0.0 or ‘a=sendonly’ in the
SDP according to the parameter ‘HoldFormat’.
8.1.1.2 Receiving Hold / Retrieve
• When an active call receives REINVITE message with either the IP address 0.0.0.0 or the
‘inactive’ string in SDP, the gateway stops sending RTP and plays a local Held Tone.
• When an active call receives REINVITE message with ‘sendonly’ string in SDP, the gateway
stops sending RTP and listens to the remote party. In this mode, it is expected that on-hold
music (or any other hold tone) is to be played (over IP) by the remote party.
8.1.2 Consultation / Alternate
• The consolation feature is relevant only for the holding party (applicable only to the
MediaPack/FXS gateway).
• After holding a call (by pressing hook-flash), the holding party hears dial tone and can now
initiate a new call that is called a consultation call.