RingCentral customers have been complaining about this for 4 years.

https://community.ringcentral.com/ringex-phone-sms-fax-6/page-tone-beep-too-loud-2671

The extremely loud beep makes my SIP speakers useless for paging. Sip speakers and paging servers have their own settings to send a beep/tone/audio file before a page. One is not needed from RingCentral. At least give the customer the option to turn it off.

We use Paging Only extensions rather extensively and every time pages are sent the phones emit an extremely loud beep before playing the page audio. The beep ignores the phone's speaker volume level is extremely intrusive. We should have the capability of disabling this beep all together.

When used, the RC paging feature sends a beep tone to the recipient of the page. This is an issue for customers who have over head paging systems as the tone is very loud. It would be nice to have the ability to disable the page tone in such scenarios. We've had multiple customers request this as the tone is so loud, it literally startles people. Some end users may also prefer to not hear the tone on pages made to desk phones.

Currently when a user pages from a phone they hear a loud beep and the devices receiving the page hear a beep as well. They would like an option to disable the beep as it's getting very annoying. There is also a community ask around this https://community.ringcentral.com/ringcentral/topics/option-to-turn-off-the-paging-tone