Manual

20
- Extra Settings -
Destination Match- This field is normally left blank. If an expression is entered here, the system
will attempt to match the text in this field with the incoming calls “Destination” field. Calls that
don’t match will be rejected. This is required when working with some PBXs. This field can also be
set as a “regular expression” for a dial plan, which is a more complex topic and can be handled
by Comrex support.
As an example, entering the following value in the field: ^(1\d{3}555210\d)$ Would match the
sequence “1xxx555210x” where “x” is any digit.
Configuring for a PBX
In the case where you wish to set up incoming lines as extensions of an upstream PBX, the instructions are very
similar. Your PBX will deliver channels to EarShot IFB in the same way a SIP provider does, and you will need to
set up the PBX and retrieve the proper credentials to program into the SIP Provider fields in EarShot IFB. IP PBX
programming is usually very complex and is usually handled by the PBX vendor. Inform the vendor that you wish
to set up an incoming only extension with “x” number of simultaneous channels and without additional features
like conferencing, transfer, etc. (since EarShot IFB doesn’t support these functions).
Gateways
Gateways allow you to use EarShot IFB with traditional analog phone lines, as well as T1, BRI and PRI ISDN, and
other legacy telephone trunks. Gateways will convert these telephone channels to SIP-style virtual phone lines.
You will need to find gateways that deliver FXO style channels on their telco side - the ports on the gateway are
designed to point toward the telephone service (and not interface with telephones and PBXs, like an FXS port
does). Setup of gateway devices can be quite complex. Comrex maintains some basic instructions on how to set
the gateways we prefer on our website www.comrex.com. Gateways deliver their virtual SIP lines differently
than SIP providers. With gateways, EarShot IFB becomes the “provider” and the gateways register with it. This
means the credentials you set up on EarShot IFB will be generated by you, and they will need to be mirrored into
the gateway. To use a gateway, both the gateway and the EarShot IFB must have Static IP addresses so they can
find each other.