I'm sure you've looked into this but when I hear of problems precisely at 15
minutes, failed SIP re-invites come to mind. If so, it might be worth
exploring whether a SIP re-invite was sent but not acknowledged for some reason.
I was glad to hear this question regarding providers. Since it has never come
up, I presumed it was a taboo topic. As a small-time hobbyist user, my
experience is limited in scope but many years have been spent on a quest for an
ideal AstLinux fit. I've had varying degrees of success and many
disappointments.
As AstLinux is so feature-rich, it can largely stand on its own with minimal
help from providers. As a result, I've gravitated to wholesale providers that
offer direct RTP from carriers, which typically reduces latency, improves voice
quality, and lowers cost. Although reduced cost wasn't my primary motivator,
it does pay for a $5/month Linode AstLinux droplet that's used as a static-IP,
SIP-only, proxy server and failover backup. [Note: With many wholesale
providers, you're on your own to handle calls during a PBX outage.]
Here are a few candidates that you may wish to explore and test. Use at your
own risk!
* Voxbeam (https://www.voxbeam.com/): Used seven years for US domestic
termination. I have limited experience with their DIDs. International
termination available. UK owned and operated so may be particularly useful for
calls to western Europe. E911 is provided only by their retail product
"Localphone," which has a bit more polish and may be more akin to Vitelity.
Offers both "direct" RTP and via points of presence in US and Amsterdam.
Listed first because of your specific requirements regarding UK calls.
* AnveoDirect (http://anveodirect.com/): Used nine years for US
domestic DIDs but only recently for US domestic termination. Some
international termination available. It is possible to select among multiple
termination carriers or use their unique least-cost-routing. Does not support
registration for DIDs but I use a static IP. Registration and E911 is provided
only by their retail product "Anveo," which I don't know much about.
* BulkVS (https://www.bulkvs.com/): Six months experience but my early
experience with DIDs and US domestic termination has been good. At the very
least, it's an intriguing product worthy of review for US domestic-only use.
Offers E911, US domestic termination only. Direct RTP only. Supports
registration as well as IP authentication. Listed last only because it doesn't
provide UK support.
One factor to consider when selecting termination carriers within the US is the
FCC's recent push for STIR/SHAKEN compliance (more
(https://en.wikipedia.org/wiki/STIR/SHAKEN)) that adds SIP header signatures to
facilitate CallerID authentication. From a practical standpoint in the short
term, STIR/SHAKEN compliance for "little guys" like me requires use of the same
termination provider as the DID provider.
Dan
On Sun, Aug 22, 2021 at 05:52 PM, David Kerr wrote:
Can anyone recommend a good SIP trunk/pstn provider? I've been using Vitelity
for years and had been happy with them, but recently long distance calls (well
specifically calls from US to UK) have lost audio about 10-15 minutes into the
call. Immediately calling back sometimes works, or sometimes it requires the
other person to call me.
I'm wondering if I should try a different provider. Any suggestions?
ThanksDavid
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