Three Way Calling

When two calls are connected to an FXS port it is now possible to configure the gateway to allow for the three calls to be connected (conference call). This feature is only available for SIP firmware builds. Depending on the configuration, the three-way call can be initiated by the FXS user using „command mode‟ (a sequence of digits are dialed to initiate the three-way connection) or using „simple mode‟ (a number of „hook-flashes‟ are performed to initiate the three-way connection). The three way call can be initiated using two different call flow scenarios:

• Call Transfer

• Call Waiting

Open

Simple Mode / Call Transfer Three Way Call

• A (SIP Phone) calls B (Analogue Phone connected to FXS port)

• A connects to B

• B performs a hookflash, dials C (SIP Phone)

• B connects to C

• B performs a further hookflash

• A, B & C enter Three Way Call

In Simple Mode the following number of hookflashes result in the following call connections:

• First hookflash = talk to 1st caller

• Second hookflash = talk to 2nd caller

• Third hookflash = conference

• Fourth hookflash as first hookflash

Simple Mode / Call Waiting Three Way Call

• Call Waiting Three Way Call initiation is not supported when the Conference mode is „Simple‟.

Command Mode / Call Transfer Three Way Call

• A (SIP Phone) calls B (Analogue Phone connected to FXS port)

• A connects to B

• B performs a hookflash, dials C (SIP Phone)

• B connects to C

• B can perform further hookflashes to toggle between A and C

• B enters command mode string (by default this is *54)

• A, B & C enter Three Way Call

Command Mode / Call Waiting Three Way Call

• A (SIP Phone) calls B (Analogue Phone connected to FXS port)

• A connects to B

• C calls B (B hears Call Waiting „beep‟)

• B performs a hookflash and connects to C

• B can perform further hookflashes to toggle between A and C

• B enters command mode string (by default this is *54)

• A, B & C enter Three Way Call

Three Way Call Indications

• When switching to talk to the 1st caller the FXS user should hear a single short beep just before being connected.

• When switching to talk to the 2nd caller the FXS user should hear two short beeps just before being connected.

• When switching to talk in conference mode the FXS user should hear a single long beep just before being connected.

Configuration
All Supplementary Services configuration can be performed via the Web User Interface (WUI). The following parameters are accessible via the Command Line Interface (CLI).

1. Enable Call Conferencing on the POTS lines which can be done via the GUI or CLI, for CLI:  set pots.port.1.call_conference="yes"

Open

• For simple mode =suppserv.profile.1.call_conference_mode=simple

• For command mode = suppserv.profile.1.call_conference_mode=cmd_mode

• Mode can be confirmed under Supplementary Services