got problem: i have two almost "out of box" installations of Elastix. versions are 1.1.8 and 1.2 RC2 and both of them have the same issue. when i add external SIP trunk from VoIP-provider with REGISTER string - it still works, and able to receive calls from VoIP, ZAP etc when my external DSL link goes down, registration fails: "sip show registry" shows that external provider is unreachable - that's OK, BUT: 1. Asterisk stops responding on incoming ZAP calls, even if they are routed to LOCAL sip phones 2. i can't place calls from internal SIP-phones. SIP calls are not routed at all. IAX soft-phones still can work normally. it looks like CHAN_SIP.SO is FROZEN at all - until i put internet cable back. when i don't use REGISTER statement, internal SIP, IAX and ZAP calls are routed without any dependency on internet connection - as it should be.