PBX-to-PBX calls, as shown in Figure 3-5, originate at a PBX at one site and terminate at a PBX at another site while using the network as the transport between the two locations. Many business environments connect sites with private tie trunks. When migrating to a converged voice and data network, this same tie-trunk connection can be emulated across an IP network. Modern PBX connections to a network are typically digital T1 or E1 with channel associated signaling (CAS) or Primary Rate Interface (PRI) signaling, although PBX connections can also be analog.
Note - PBX-to-PBX calls are another form of toll-bypass.
An example of a PBX-to-PBX call is one staff member calling another staff member at a remote office. The call is sent from the local PBX, through a voice-enabled router, across the IP network, through the remote voice-enabled router, and terminated on the remote office PBX.
You can configure a QSIG link between the PBX's to the voice gateways. Then, configure the necessary dial peers between the gateways to have calls traverse over the IP network. On the other end, you also have a QSIG link to the other PBX to terminate the call.
thanks for the article. i guess i don't know enough about voice to do this on my own.
some of the voice codecs, isdn configs, and dial-peers are kind of confusing for me. perhaps this isn't something I shouldn't attempt because all I pretty much know is routing. And all I want to do is route whatever comes out of the PBX at Location A, to the PBX at Location B, and vice versa.
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