SIP trunking enables VOIP access for your SIP-enabled PBX. SIP trunks are sold per call session and provide all the features of a PRI with the cost savings of VOIP. Direct Inward Dial (DID) Caller ID Automatic routing to an external number if your PBX is offline Save up to 50% in monthly voice and data costs over traditional solutions Speed up ROI by leveraging your telcom investment Eliminate long-distance charges Scales to fit your company size today and tomorrow