Brian, The easiest solution from understanding your problem is to order an additional Pri from your service provider and have them configure the trunks using NFAS (Non-facilities associated signaling) This will allow you to increase the B channel count by 24 and retain the same dial number for inbound calls. NFAS allows multiple Pri circuits to use a single D-channel to control signalling for all of the Pri's in the group. You gain the 24th B channel on the Pri since no D-channel is required. You will need an additional Pri ports on your HQ router because they are goingto hand you another physical circuit. The catch is that some service providers I've run into only allow a few Pri's in an NFAS configuration, even though a single D-channel has the capabiltity to signal for up to 28 T1's (or a DS-3). As for the single IP, it will stay on the serial0:23 (ex.) interface of your D-channel. Hope this helps.
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