I know that the syntax for registration is register => user[:secret[:authuser]]@host[:port][/contact] but then most of the TSP allow me to register without specifying the <contact> field. This allows me to use the <s> extension to process all incoming calls. Now, with this specific TSP (phonesystems.net) registration is succesful only if my Asterisk passes a contact number, any number at that, as long as it's different from the <user> field. Their support line told me they also use ASTERISK. My questions are: 1) what type of set-up in the service provider's ASTERISK box requires that a contact number be provided by the registering box? 2) while I can process the incoming calls from all other TSPs using the "s" extension, therefore needing only one set of instructions common to all, the incoming call processing instructions for this TSP have to use the <contact> as an extension, hence unnecessary code duplication. Is there a way around it except for using extension <contact> also for the other TSPs? Thanks for your help. Costa --------------------------------- Do you Yahoo!? Make Yahoo! your home page -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20050414/3b9c47a4/attachment.htm