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Primary DID - SIP or Traditional POTS?

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@Bullfrog wrote:

I'm curious what would be considered a standard for most VoIP integrations. Do you generally prefer to port a business's primary DID to a SIP trunk provider? Or is it best practice to keep it with a local POTS provider? I see the benefits of having backup POTS lines for redundancy, especially when internet data connections are not stable.

It seems that if I keep the primary business DID with a traditional provider, all incoming calls would ring through that line, then Call Forward - Busy to a SIP DID that rings to the FreePBX server. The only benefit here seems to be the local White Pages listing provided by the phone company. (Does anyone use those any more?)

If I move the primary DID to a SIP provider, we have the benefit of having all calls rolling through SIP services. In case of an internet outage, they would fail over to the "backup" POTS line. My concern here is: How reliable is porting IN and OUT of such SIP providers? I have read and heard horror stories, including being able to port to such providers, but then being "stuck", unable to port back anywhere else if required.

I would love to hear the thoughts/experiences of those who have experience with these scenarios and the general "best practice" approach. Thanks!

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