SIP for Phone Systems allows your Voice Over Internet Protocol enabled PBX phone system to directly talk to ACD's Telephone Switch. SIP Phone Service is for Companies that want to make full use of an investment in an IP-PBX by utilizing SIP to connect to the traditional Public Switched Telephone Network (PSTN). Unlike in traditional telephony, where bundles of physical wires were once delivered from the service provider to a business, a SIP trunk allows a company to replace these traditional fixed lines with SIP Trunking Service which travels over data networks. This service can significantly lower costs for many customers since you don't need traditional POTS phone line connections. This direct connection uses the SIP (Session Initiation Protocol), which is the new standard for sending calls over data networks. The use of ACD.net's VoIP service can drastically decrease company phone bills by as much as 40-70%.

There are some requirements and components necessary to successfully deploy SIP trunks.

The PBX
In most cases the PBX is an IP-based PBX, communicating with all endpoints over IP, but it may just as well be a traditional digital or analog PBX. The sole requirement is that an interface for SIP trunking connectivity is available.

Router/Firewall Edge Device
ACD.net can provide the router/firewall with complete support for SIP necessary for handling the traversal of the SIP traffic.

Service Provider
ACD.net is the Internet Telephone Service Provider (ITSP) that connects to the Public Switched Telephone Network (PSTN).

ACD has a long history of operating SIP service, being one of the first local providers to offer service. ACD's SIP Phone Service is already fully tested and compatible with nearly all PBX vendor's equipment. We have advanced tools that we can use to debug and quickly resolve any quality of service issues and traffic prioritization. We are the experts in this business.

Some of the popular systems that are live and operational with our service. This is only a partial list. Please let us know and we will test.

	All versions of Cisco Call Manager, Cisco Session Controllers, and Cisco IP Phones, Cisco Routers, with VWIC cards, and ATA adapters
	All versions of SIP phones, ATA adapters
	All versions of Avaya and Avaya Office system
	Certified on all Toshiba Phone Systems
	All versions of open source Asterisk and its derivitives
	All Adtran Phones, PBX System, Netvanta routers, 9XX Series IADs, and 6XX series IADs (MGCP)