High-quality telephony SIP IP VOIP

Switch to high-quality SIP telephony!
Stable connection without interruptions, pauses and interceptions.
75% dialing - high result
Per-second billing
Call recording and prompter (listening and online participation)
Convenient replenishment in USDT/BTC via bot
Separate numbers for receiving incoming calls
Connection and testing for free
Instant technical support
Personal account with online balance, recordings and prompter
Flexible tariffs for clients with a large number of users.
The reputation of our service is as clean as possible.
GEO - 150 countries.
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I see it's been a while since this was posted, but I just wanted to ask—has anyone tried using current open-source SIP clients like Jami or Linphone lately? Curious how they hold up for call quality and reliability compared to paid services. Also wondering what setups people are using nowadays for securing VoIP—any simple tools you’d recommend for encryption or traffic monitoring?

Tried setting up a small office with SIP and VOIP a while back, and the difference in call quality was noticeable. Later, testing a cloud call center setup for a side project made handling multiple lines super smooth, and routing calls was way easier than juggling physical phones.