Bridge calls are working ok between 2 sites. The Main site is 4 digit extensions Remote site is 3 digit extensions The remote site extensions are 920-960 (Same extensions from legacy system. Not sure I am thrilled with the 911 emergency code in the same range though.) The internal site id is 109. So, the dialing rule is dial "109" then last 2 of extension. so 10920 The rule strips the 10 and dials over the bridge. Works great. So - on to the issue. On an iPhone and Yealink (not sure about Android. But 3cx Phone for Windows is ok): Now when I call the main site from remote side, it has only the 3 digit extension. So, I go into the bridge setup at Main site and add "Outbound Rule Prefix" of 10. This way, it should show 10920. Instead it shows 0920. So, instead I add 110 as the outbound rule prefix and it shows correctly. If I change these to a 5 or 55 then both digits show. Any idea why the first digit is now showing when set to 10?