You need to enter the number exactly as the provider itself you are using for the number would expect to see it sent to them.
So for instance, when you call via SipBroker, you'd enter something like this:
*393613 (and that would be the equivalent of 'calling' by SIP URI sip:*393613@sipbroker.com)
When via Voxalot, you'd enter:
123456 (and that would be the equivalent of 'calling' by SIP URI sip:123456@voxalot.com)
When via Gizmo Project as the provider to a North American toll free, you'd dial:
18005558355 (and that would be the equivalent of 'calling' by SIP URI sip:18005558355@proxy01.sipphone.com using your username/password credentials - the same number could be dialed by sip:*74718005558355@sipbroker.com or *74718005558355 via SipBroker in the webcallback)
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