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Configuring Trunk Groups
A trunk group is used to transmit signaling and media data between central office, and is used to constitute a route. In TDM scenarios, a trunk group is a set of trunk circuits with the same attributes. Generally, a group of trunk circuits with the same attributes in the same direction are called a trunk group.
- Configuring an AT0 Trunk Group
An AT0 trunk group implements voice communication between PBX users and inter-office users. It is an analog circuit trunk and uses the FXO interface of the PBX to connect to the PSTN through a common telephone line. - Configuring SIP Trunk Groups
The PBX supports three types of SIP trunk groups: SIP AT0, SIP PRA, and SIP IP. - Configuring an H.323 Trunk Group
An H.323 trunk group implements voice communication between PBX users and inter-office users. The H.323 trunk is a packet trunk based on the IP network, and it uses H.323. - Configuring a BRA Trunk Group
A BRA trunk group implements voice communication between PBX users and inter-office users. A BRA trunk is a digital circuit trunk. If a BRA trunk is bound to a BRA interface, the BRA trunk supports a maximum of two simultaneous voice calls. If the BRA trunk is bound to multiple BRA interfaces, the number of supported voice calls is twice the number of bound BRA interfaces. - Configuring a PRA Trunk Group
A PRA trunk group implements voice communication between PBX users and inter-office users. A PRA trunk is a digital circuit trunk and uses an E1 interface on the PBX to connect to the remote device through an E1 trunk line. - Configuring an R2 Trunk Group
An R2 trunk group implements voice communication between PBX users and inter-office users. An R2 trunk is a digital circuit trunk and uses an E1 interface on the PBX to connect to the remote device through an E1 trunk line. It uses R2 signaling.