What is BGCF - Breakout Gateway Control Function
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The Breakout Gateway Control Function (BGCF) is responsible for selecting break
out operator and/or site for outbound sessions to the PSTN. It is the logical entity within the IMS network that decides how to route the Telephony sessions initiated in the IMS network and destined for a circuit switched network .
The circuit switched networks can be any legacy network, PSTN or other wireless networks. If breakout occurs in the IMS network, then the BGCF routes the session to a Media Gateway Control Function that then allocates a Media Gateway or the BGCF routes the session to a BGCF in another operators network