[asterisk-users] placing calls with linphone.org SIP account

[Yves]

Happy new year!

maybe off-topic... but maybe someone _knows_ a solution.

I have a free SIP Account at linphone.org... calling other linphone.org 
users via SIP and receiving SIP calls from other users
registered at linphone.org is no problem... just "dial" the username... 
BUT... as far as I understand the documentation, linphone.org
offers internet wide SIP Calls... so... how can I call other users 
registered at other SIP-Providers?
I tried all well-known SIP URI Syntaxes but none worked... does anyone 
reliably know, if it is possible at all and if so, what is the
dialstring looking like? (I am trying with zoiper softphone)

Unfortunately there is no support-email-address for linphone.org users...

thanks,
yves

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