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...(TG100 GSM gateway). > > Thanks in advance. Hello: I solved my issue by changing type=friend with type=peer in [555555555] section, afterwards, googling I've found this article that explain me why: http://forums.digium.com/viewtopic.php?t=79338#p161214 Re: type=friend is bad for you Postby thor ? Tue Aug 02, 2011 11:24 am Another little known fact about the difference between peer and friend: Friend will challenge INVITEs. When making outbound calls from a registered phone/peer another challenge will be issued. This means type=friend requires second INVITE with authentication creden...