OnSIP Cloud Phone System provides business communication services without the commitment of a traditional phone service provider and vendor lock-in.
OnSIP also provides a robust Unified Communication PaaS, that sports integrations with ZenDesk and Slack, or roll your own with the SIP.js library.
At OnSIP, I worked with the development team and upstream carriers to enable geographic redundancy.
Occasionally, I'll also perform deep dives into the carrier's network to figure out what's broken.
Sometimes they'll fix it, othertimes it's a bit more complex, like Verizon's SIP ALG.
It's also at OnSIP where I first started tinkering with Python, specifically the Paramiko library, for the purpse of doing some CLI scraping of Cisco and Juniper devices.
Definitely check out OnSIP for your business communication needs.