If it's a TDM link, there aren't really any special considerations other than setting the Line Build Out to < 150ft (I forgot the specific details here, but choose the appropriate levels). In the old TDM world, there is no FXO/FXS considerations but there is a huge thing about clocking. For the telco side of your PRI, you'll have to set your end as the slave and the PRI that's going towards your PBX has to be set as master and having your legacy PBX being set as a slave. Btw, North American PRI's are really T1's in disguise, so yes you can go ahead and use your existing T1 cards if you have one. ;) On Tue, Sep 11, 2012 at 9:02 AM, Spencer Thomason <spencer@5ninesolutions.com> wrote:

Hello, I have a customer with a Comdial PBX that we would like to connect using SIP trunks. The Comdial is currently connected via ISDN PRI. Before the numbers are ported, the existing PRI will need to be active for inbound calls. Can I use a Freeswitch server with a 2 (one port to PBX, one to PSTN) T1 Sangoma card to do this? Would I need hardware echo cancelation since the cable run would only be about 10 feet? Are there any directional (i.e. FXO/FXS in the analog world) or timing considerations?

Forgive my ignorance, my background is primarily on the SIP side of things.

Thanks for any help, Spencer

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