Simplify number matching rules. Make '+' optional.

[dennwc]

Quite a few support questions from customers regarding SIP are made because of a tiny mistake in the number format in their Trunks. Twilio requires leading +, while Telnyx omits it by default.

This change makes + always optional for inbound calls. We will still accept the call if the Trunk has + set, but INVITE omits it (and vise versa).

In addition, make effort to fix outbound calls (CreateSIPParticipant requests) too by checking the base domain in SIP URI. It's not perfect and won't work if provider changes the domain. But it will help avoid most common problems.

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