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AnchorSite determines which Telnyx Point of Presence (PoP) handles media routing for SIP calls.

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Configuration modes

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Latency mode

Automatically selects the optimal PoP based on ICMP ping latency measurements to the SIP endpoint. Requirements:
  • IP/FQDN authentication: Whitelist Telnyx media IP addresses for ICMP.
  • Credential authentication: Include username in Contact header or X-Telnyx-Username header:
Contact: <sip:user@192.0.2.10:5060>
X-Telnyx-Username: connection_username
  • TeXML: PoP selected based on latency to webhook URL IP.

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Manual mode

Explicitly select a PoP for predictable routing behavior. Available PoPs:
ValueLocation
Chicago, ILNorth America Central
Ashburn, VANorth America East
San Jose, CANorth America West
Toronto, CanadaNorth America Northeast
Montreal, CanadaNorth America Northeast
Vancouver, CanadaNorth America Northwest
London, UKEurope West
Amsterdam, NetherlandsEurope
Frankfurt, GermanyEurope Central
Sydney, AustraliaAsia Pacific

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Configuration

You can configure AnchorSite in the Telnyx Portal by editing an IP Connection:
IP Connection settings in the Telnyx Portal showing the AnchorSite Override dropdown with Latency and manual PoP options
PATCH /v2/ip_connections/: 
{
  "anchorsite_override": "latency"
}
For manual selection: 
{
  "anchorsite_override": "Chicago, IL"
}

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Failover

If the selected PoP is unavailable (maintenance, outage, health check failure), calls automatically reroute through the next available PoP.