This, Citel says, reduces costs and increases business productivity and continuity, by eliminating existing branch office phone lines and connecting locations with IP telephony.

"Distributed enterprises need a better solution for connecting branch offices and remote workers," said Michael Robinson, CEO of Citel. "By combining our EXTenders with SIP trunking, distributed enterprise customers can literally get more for less. More features, more productivity, and more reliability at lower operating cost than today's PSTN-based solutions."

Citel's SIP trunking voice solution includes Citel's PBXgateway (I or II) at the central PBX site, and Citel EXTender 4100, 6000, IP6000, or 7000 at remote locations. The solution, combined with SIP trunks from a service provider, enables enterprises that conduct operations around the country (or around the world) to reduce their monthly long distance charges by replacing at least one T1 connection within a remote office.

The SIP trunking voice solution from Citel also results in one dialing plan and voicemail system administered by an enterprise's headquarters.