Different Methods of Call Hold/Call Transfer
1. Call Hold by re-INVITE / Call Transfer by REFER
Many SIP devices support Call Hold by re-INVITE (HOLD button) and/or Call Transfer by REFER (TRANSFER button). You can use these features with Brekeke PBX.
When using Brekeke PBX, re-INVITE/REFER requests are processed by the server, so Call Hold and Call Transfer will work even if the other party’s device does not support re-INVITE or REFER.
2. Call Hold/Call Transfer Using Keypad Commands
Even if a SIP device does not support Call Hold by re-INVITE or Call Transfer by REFER, it can send commands to Brekeke PBX by using DTMF (Keypad) for Call Hold/Call Transfer. On some devices, you may be able to assign DTMF numbers to HOLD/TRANSFER buttons and use them for the proprietary Brekeke PBX method of Call Hold/Call Transfer. Keypad commands for Brekeke PBX are listed in the Brekeke PBX Users Guide.