Are you future proofing your voice?

Do you...

I need to decide how. I'm already there. Your tech istoo old? Your PABXuses ISDN? Your PABX alreadysupports SIP?
I need to decide how. I'm already there. Your tech istoo old? Your PABXuses ISDN? Your PABX alreadysupports SIP?
Your PABXuses ISDN? Your tech istoo old? Your PABX alreadysupports SIP? I need to decide how. I'm already there.