Connecting to a 3rd party device in PRI gateway setup.

It is very important to have a conversion with a technical expert who is administering the 3rd party PBX as to which PRI config parameters to use.

You will need to discuss things like timing modes, framing and switching - see below. There must be an agreement as to which device will be playing the role of

timing slave and timing master.

1. Timing Mode: Set the correct timing mode, in the gateway scenario we will be playing the role of the 'Telco' or the NT (Network Terminal).
   1. Please select 'local' as the timing mode to produce the timing signal from the Com.X, this timing signal will be used to establish layer 1 PRI comms with the
   2. connected 3rd party PBX.

1. Framing: From the bit stream we now have available from the establishment of layer 1 comms we can now generate frames which will define the T1/E1 channels.
2. This defines the purpose of layer 2. This sequence of bits now becomes 'Channelized' according to T1(American 24 channels) / E1 (European 32 channels) standards.

1. Switching: European Telecommunication Standard or "ETSI". This defines the ISDN standards to be used.