Absolutely Yes, It’s a good idea to maintain your existing numbers.
If you are okay to adventure new technologies, you should consider port your numbers to a SIP trunk provider.
If you don’t want this option and want to use back your existing PSTN or ISDN lines, then simply purchase a Yeastar VoIP gateway from us and use it to bridge your lines to our Yeastar Cloud PBX.
More details about Yeastar VoIP gateway can be found here:
