What is SIP Trunking?
SIP Trunking: SIP trunking (Session Initiation Protocol trunking) connects your existing on-premise PBX or phone system to the public telephone network via the internet. It replaces traditional ISDN/PRI phone lines with a cloud connection — dramatically reducing telephony costs.
How It Works
A SIP trunk is a virtual phone line that carries voice calls as IP data. Your PBX connects to VestaCall's SIP trunking service via a SIP-compatible IP connection. Calls route through VestaCall's network to reach any phone in the world. You pay per channel (simultaneous call capacity) rather than per physical line.
Business Use Cases
Companies with existing PBX systems use SIP trunking to add VoIP capabilities without replacing hardware. Large enterprises use SIP trunks to consolidate telephony costs across multiple offices. Call centers use SIP trunking to scale call capacity up or down based on demand without leasing physical lines.
How VestaCall Uses SIP Trunking
VestaCall offers enterprise SIP trunking with unlimited channels, local and toll-free DID numbers, 99.999% uptime SLA, and automatic failover. Integration with Cisco, Avaya, Asterisk, and most SIP-compatible PBX systems.
VestaCall SIP Trunking