then it would be a full-time job to enter the carriers for every location :)
also most of carriers are quite standard and require only a username, domain and password, so there's not much to list in such a catalog.
I would suggest to keep it in a documented format and let the local administrator decide what to do with it.
From: Richard Mace <richard.mace@gmail.com>
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Sent: Wednesday, June 26, 2013 6:33 AM
Subject: Re: [Freeswitch-users] Popular carriers