Q931 backhauling is a term used to describe the process of
transporting Q931 signaling messages over an IP network between two IP PBX
systems. In other words, it is the transmission of Q931 signaling over an IP
network. Q931 is a protocol used in ISDN (Integrated Services Digital
Network) networks to establish, maintain, and release connections between
endpoints.
The term “backhauling” refers to the process of transporting traffic from a
remote location back to a central location. In the case of Q931 backhauling,
this traffic refers to signaling messages that are sent between two IP PBX
systems.
Q931 backhauling can be used in a variety of situations, including:
When connecting two different IP PBX systems together
When connecting an IP PBX system to a legacy PBX system that uses ISDN
signaling
When connecting two legacy PBX systems together over an IP network
To implement Q931 backhauling, a special gateway device is typically used.
This device is responsible for converting the Q931 signaling messages into
IP packets that can be transmitted over the network. The device also
performs the opposite conversion, taking IP packets containing Q931
signaling messages and converting them back into Q931 messages for
transmission over an ISDN network.
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The protocol used for Q931 backhauling is typically SIP (Session Initiation
Protocol), which is a signaling protocol used in VoIP networks for call
setup, teardown, and other call control functions. SIP is often used because
it is a standard protocol that is widely supported by IP PBX systems and
other VoIP devices.
In summary, Q931 backhauling is the process of transporting Q931 signaling
messages over an IP network between two IP PBX systems. This is typically
accomplished using a special gateway device and the SIP protocol. By using
Q931 backhauling, organizations can connect different types of PBX systems
together over an IP network, providing greater flexibility and cost
savings.