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I've got a couple of extensions in users.conf that have both SIP and IAX access(IAX softphone, SIP hard phone). I'd like to setup my dial string to "check" to see which they are actively registered with, and send the call appropriately. Right now I have: Exten => _4xx,1,Dial(SIP/${EXTEN}&IAX2/${EXTEN}) But not all phones have both techs, so there is a lot of