Support / Voice / SIP Trunking

SIP trunk configuration and troubleshooting.

Guides for the trunk-level settings that govern how a PBX, SBC, or application connects to VoiceTel — authentication mode, DID routing behavior, registration domains, and common failure modes.

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Articles

  • Authentication types and DID routing

    The four supported authentication types (Digest, Lax, IP, Strict) and how they interact with DID routing — Digest routes versus Route Destinations, IP address lists, geographic routing, and the outbound SIP requirements that apply when IP authentication is in use.

  • Whitelisting VoiceTel IP addresses

    The signaling and media subnets — Amazon proxy and RTPProxy, plus the SJC, DFW, ORD, DEN, NYC, AMS colocations and the Anycast range — that customer firewalls, PBX ACLs, and SBC trusted-IP lists need to allow for SIP and RTP to flow.

  • IP termination using an account prefix

    Outbound IP-authenticated termination using the ACCOUNT#DEST@geo.voicetel.com dialing format. Endpoints, dialing-format rules, approved IP setup, and how the account prefix scopes the call to the right tenant.

  • IP termination using From tag

    Outbound IP-authenticated termination where the SIP From username carries the account ID and the caller ID rides in P-Asserted-Identity or Remote-Party-ID. Asterisk and FreeSWITCH examples included.

  • Inconsistent PBX registration

    Checklist for intermittent registration failures: credentials, ACL placement on Switchvox-class systems, profile-restart verification, in-memory ban clearing, and registration-target rotation.

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