On Tue, 21 Dec 2004 23:21:50 -0800, Chris Travers wrote: >Fractional T1's don't have the 4 to 2 wire conversions at your phone >switch of you are doing VOIP or other digital telephony technologies. >As a result, you should not have to deal with echo cancellation as much >if you are on a fully digital circuit. This means your system is >simpler and easier to maintain if everything is digital end-to-end. > >However, T1 cards are far more expensive for a few lines than FXO cards >so if you only need two lines, you might consider a BRI instead, and >maybe POTS with DSL. > >Fractional T1's are just an ordinary T1 with only a certain number of >channels active. You still have all the hardware needed for a T1, but >you are not paying for more capacity than you need on the actial telco >connection. > >For 4 or fewer lines, I would probably consider dual BRI's or quad FXO's >(due to infrastructure cost) but for more than that, I think that the T1 >solution is so much easier to work with that it wins out completely. Of >course if you need to be able to add capacity quickly, then the >fractional T1 is better.
The problem is the FXOs. As has been mentioned on list many, many times, FXO interfaces generally suck. I presently use a TDM400p and it's the best I've tried thus far. If it doesn't end up satisfactory as I scale to 3 or 4 lines then my next move will be to try BRIs. FWIW, I'm also going to try adding a Zultys 4x5 IP phone. It has one on-board FXO which was initially only for life-line use. However, their most recent firmware allows the phone to forward the FXO to the pbx for voicemail, forwarding, conferencing, etc. I don't think that the pbx can make a call through the FXO, but the phones internal dialplan can select the FXO for certain calling patterns, ip for all else. A friend has this phone and is not using it at the moment. I'm going to borrow it for a month and see how it does. It also has bluetooth for headset applications. Maybe very nice. Michael -- Michael Graves [EMAIL PROTECTED] Sr. Product Specialist www.pixelpower.com Pixel Power Inc. [EMAIL PROTECTED] o713-861-4005 o800-905-6412 c713-201-1262 _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
