FAQs

faq – exotel sip trunking 1\ what is exotel sip trunking? exotel sip trunking connects your pbx, contact center, or voice ai system to the telephone network over sip it supports inbound, outbound, and bi directional calling 2\ what systems can i connect using sip trunking? any sip compliant system such as asterisk, freepbx, sbcs, contact centers, or voice ai platforms can be connected 3\ what are inbound and outbound calls? outbound calls go from your sip system to phone numbers inbound calls come from phone numbers to your sip system 4\ what is mode pstn? pstn routes calls to and from the telephone network this is the default mode for standard calling 5\ what is mode flow? flow routes calls to exotel flows such as voicebot or app bazaar applets it is required for voicebot and non connect applets 6\ do i need to set a destination uri even when using flow? yes a destination uri is mandatory on the trunk for routing and validation, even if the call later goes to flow 7\ do i need a static ip? a static ip is required for outbound calls and streamkit inbound calls can use either ip or fqdn 8\ can i use fqdn instead of ip? yes, fqdn is supported only for inbound calls (pstn → sip) outbound calls require ip based whitelisting 9\ do i need to whitelist ips for inbound calls? no for inbound calls, exotel initiates the connection and you only need to allow exotel source ips in your firewall 10\ do i need to whitelist ips for outbound calls? yes your sip server ip must be whitelisted using the map acl api, otherwise outbound calls will fail 11\ which ports should i open on my firewall? open 443 (tls) or 5070 (tcp) for signaling and udp 10000–40000 for rtp media 12\ do i need to fix source ports for inbound calls? no source ports are dynamic by design you only need to expose a fixed destination port on your sip server 13\ calls are connecting but there is no audio why? this usually means rtp ports are blocked ensure udp ports 10000–40000 are open in your firewall 14\ what does “duplicate resource” error mean? it means the configuration already exists (ip, number, or trunk) this error is safe to ignore 15\ which audio codec should i use in india? use g 711 (india standard) avoid configuring unnecessary codecs