Many businesses have made substantial investments in PBX equipment for their phone systems and aren’t willing to scrap that investment for an entirely software-based phone system. VoIP technology transmits telephone calls across IP networks, including the Internet so there aren’t and tolls that come with the traditional PSTN networks.
Session Initial Protocol (SIP) is the standard protocol used for transmitting telephone calls across IP networks. Much like the Hypertext Transport Protocol (HTTP) that sends and receives data from websites, SIP takes care of the signaling and transmission of phone calls between two computers, a computer and an IP phone, or two IP phones.
The good news is that cloud phone services offer SIP trunking, which ties your existing PBX system into your IP network. This allows your PBX to use the SIP protocol to send telephone calls over IP networks instead of PSTN – giving you unlimited local and long-distance calls for a fixed price or lower rate plan.
With SIP trunking, your old phone system can get a modern make-over and offer you features such as rich high-definition (HD) voice quality, and the scalability and reliability that come with cloud phone services. SIP trunking with a cloud phone service is a simple and inexpensive way for your company to improve its phone system quality while using the existing IP networks already in place for other parts of your business.