Why were outgoing calls from Bitrix used to be made, but now not?

Question

Telephony

In September-October, it was possible to make calls from Bitrix24 - directly from it.
Now for some reason it doesn't, and the incoming ones are malfunctioning.
Used numbers on Rostelecom.

This feature could have been free, but now it's paid?
SIP is not connected, only the Rostelecom VATS application is used. Googled - I see that others are connected to the SIP-PBX. But I don't understand why outgoing calls used to go.

Thank you.