Overview

this document explains what exotel sip trunking is, how it works, and what problems it solves what is sip trunking? sip (session initiation protocol) trunking allows you to make and receive phone calls over the internet instead of traditional telephone lines (pri / isdn) with exotel sip trunking, your pbx, contact center, or sip enabled system connects directly to the telephone network (pstn) using exotel’s cloud infrastructure this eliminates physical telephony hardware while enabling scalable, programmable voice connectivity what exotel provides exotel acts as the sip gateway between your system and the telephone network sip signaling and media handling routing to mobile, landline, and toll free numbers high availability across multiple regions optional routing to voice ai using streamkit high level architecture your system communicates with exotel using sip exotel handles connectivity to the telephone network call directions exotel sip trunking supports the following call directions outbound (sip → pstn) your system initiates a call to a phone number your sip system → exotel → pstn → customer phone typical use cases agent outbound calling dialer campaigns click to call from applications outbound calls require your server’s public ip to be whitelisted inbound (pstn → sip) your system receives calls from phone numbers customer phone → pstn → exotel → your sip system typical use cases customer support numbers ivr and call routing contact center queues inbound calls are routed to an ip address or fqdn configured on the trunk streamkit (voice ai routing) in addition to pstn routing, exotel sip trunking can route calls to voice ai bots using streamkit your sip system → exotel → voice ai (websocket) this is enabled using mode flow when mapping a phone number to a trunk typical use cases ai powered ivr voice bots speech analytics agent assist supported routing modes mode description pstn routes calls to the telephone network (default) flow routes calls to voice ai using streamkit the routing mode is configured per phone number what you can build with sip trunking enterprise contact centers outbound calling platforms automated voice systems voice ai integrations hybrid human + bot call flows what’s next to make your first call, go to quick start to understand routing behavior, see call directions & modes to configure sip trunking, see setup