FAQ-What Are Trunks

Publication Date:  2015-05-06 Views:  216 Downloads:  0
Issue Description
What Are Trunks?
Solution
A trunk is a logical link between two exchange offices. Inter-office calls must be transmitted by trunks. The device supports the following trunk modes:
  • PRA trunk
A PRA trunk is connected to a VE1 interface and is usually used to connect two PBXs.
  • AT0 trunk
An AT0 trunk is connected to an FXO interface for accessing the PSTN network. The PBX enterprise needs to use the AT0 trunk for making calls to non-enterprise numbers or making long-distance fixed-line calls.
  • SIP trunk
A SIP trunk is established on an IP link and connects a PBX and an IMS. There are two types of SIP trunks: SIP AT0 trunk and common SIP trunk.
  • E1R2 trunk
The E1R2 trunk is bound to VE1 interfaces and is usually used to connect two PBXs. The E1R2 trunk can be connected to a peer device using R2 signaling.

NOTE:
The device supports the E1R2 trunk from V200R002C00.
  • H323 trunk
An H323 trunk is established on an IP link. It connects a PBX and an IMS or connects PBXs in different areas.

NOTE:
The device supports the H323 trunk from V200R002C01.
  • BRA trunk
A BRA trunk is bound to a BRA interface and connects a PBX and an ISDN.

NOTE:
The device supports the BRA trunk from V200R002C02.

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