What is SIP Trunk?
A business that has an existing working phone system can simply order SIP Trunks to replace their existing phone lines from the local telephone company. A On-Premise PBX will have either a SIP card that will allow you to directly connect a Internet connection to the system, a PRI card that will allow for up to 24 calls to be handled or a traditional analog card that will only allow calls based on its ports (usually 6, 8 or 12). A phone system with a SIP Card will just need to be programmed to match the SIP Providers settings. A PBX with either a PRI or analog card will need a device called an ATA that will convert the signal to a digital connection.
SIP Trunk Providers Motion VOIP can quote for you:
NET2PHONE
Net2Phone was founded in 1990 to pioneer VoIP communications and has become a leading VoIP services provider. Net2Phone is a subsidiary of IDT Corporation, a NYSE listed company with annual revenues in excess of $1.5 billion..
4VOICE
4Voice's mission is to provide customized business phone solutions that not only deliver the tools of legacy systems, but also purvey the best of modern reporting and low-overhead cloud VoIP, within a budget that is predictable and manageable.
8x8
8x8, Inc. (NYSE: EGHT) is transforming the future of business communications as a leading Software-as-a-Service provider of voice, video, chat, contact center and enterprise-class API solutions powered by one global cloud communications platform.
NEXTIVA
Nextiva, Inc. is a cloud-based VoIP communications company founded in 2006 and based in Scottsdale, Arizona, United States. The company offers office telephony services to the small and medium-size companies serving in the United States and Canada.