Check these guys out...they make the YeaLink IP phones and have a 96 port FXS gateway that works in both SIP and MGCP http://www.voptech.com/product_view.asp?tid=43&id=154 From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] On Behalf Of Shripal Daphtary Sent: Wednesday, January 25, 2012 2:25 PM To: VoiceOps at voiceops.org Subject: [VoiceOps] question about campus installations Hey all, i have a question that i could use some help on. I have a customer that wants to replace a PBX that is shared between administration and residences in a campus environment with a VoIP solution. PBX currently has a digital phone in each residence connected via CAT3/rj11 back to a RJ21x the MDF. There are 238 units. customer would like to provide POTs service to each residence with some class 5 features, VM, CLID, 3WAY, etc. There is not Cat5/rj45 connections in any of the units. I was thinking of bringing in several Adit600 chassis, with 5x8port FXS cards in each, which would give me 40 FXS ports/chassis. meaning 6 chassis. i would likely use MGCP, b/c it works well with the Adit. I can't seem to find a better/larger device that does more than 40 FXS ports, besides a PBX. does anyone know of a product/channel bank that can handle more? i can do SIP or MGCP. oh, i know that i can get a CAT 6500 and populate it with a couple CMMs and populate the CMMs with 24 port FXS cards (WS-SVC-CMM-24FXS), but the client can't maintain it. I'm running an Broadsoft M6. thanks! Shri