![]() Open ports on your firewall as per our IP addresses.Ĭause: Your PBX cannot access a DNS server on the public internet.Termination calls (Your PBX/SBC to the PSTN) You are not getting any response to your SIP requestsĬause: Your firewall is blocking the outbound SIP requests to Twilio. The person on your PBX can hear the person on the PSTN end of the call, but not vice-versa.The person out on the PSTN can hear the person on your PBX but not vice versa.Your call fails with a '415 Unsupported media type' error. ![]()
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