Hosted PBX Paging


We’re using FreePBX 2.5.1 on Asterisk We have 75 phones in 2 offices and our PBX is in a rack at a corporate datacenter. 1 of our offices in on DSL with 500k of upload capacity and 6000k of download capacity. We are using GXP2010 phones. We would like to page every phone simultaneously, but are finding that each phone is trying to upload back to the server (even though the speaker on the phones being paged is disabled), effectively saturating our upload bandwidth. Does anybody know if there a way to disable the upstream audio from the paged phones when the page-all feature is being used?