Search on this blog

Search on this blog

Log in

Contact Us

Telxi · SIP Trunk Integration

Connecting your Telxi SIP Trunk to ElevenLabs

Import your Telxi number into ElevenLabs Agents over SIP trunking — inbound and outbound, in one dialog.

This guide shows how to connect a Telxi SIP trunk to ElevenLabs Agents, so your voice agents can make and receive calls over the PSTN using your Telxi numbers. ElevenLabs configures everything in a single Import a phone number from SIP trunk dialog, with separate Inbound and Outbound sections.

Inbound configurationHow calls from Telxi reach ElevenLabs. No SIP credentials needed.
Outbound configurationHow ElevenLabs dials out through Telxi. SIP credentials required.
Assign & testAttach the number to an agent and place a call.

Architecture at a glance

Caller / PSTN Any phone Telxi SIP Trunk sip.telxi.com port 5060 · TCP ElevenLabs sip.rtc.elevenlabs.io Inbound + Outbound AI Agent Your agent Inbound — Telxi sends the call to ElevenLabs (no credentials) Outbound — ElevenLabs dials Telxi (SIP username + password)
One import dialog covers both legs: inbound uses no credentials, outbound authenticates to Telxi with your SIP username and password.

Telxi connection details

Address / Domain
sip.telxi.com
Port
5060
Transport
TCP
Media encryption
Disabled

ElevenLabs connection details

ElevenLabs SIP URI
sip:sip.rtc.elevenlabs.io:5060;transport=tcp
Ports
5060 (TCP) · 5061 (TLS)
Audio codecs
G711 (8 kHz) · G722 (16 kHz)
Auth methods
Digest (username/password) or ACL (IP allowlist)

Inbound vs. Outbound configuration

Inbound configuration SIP username leave empty SIP password leave empty Media encryption Disabled Transport TCP Address / Domain sip.telxi.com Outbound configuration SIP username required SIP password required Media encryption Disabled Transport TCP Address / Domain sip.telxi.com
The only difference between the two sections is the credentials: inbound stays empty, outbound needs your Telxi SIP username and password.

Prerequisites

  • An ElevenLabs account with access to Agents → Phone Numbers.
  • An active Telxi SIP trunk with at least one DID on your Telxi account.
  • Your Telxi SIP username and password (needed for the outbound section).
1

Get your trunk details from Telxi

  • Outbound (required): Sign in at portal.telxi.com → SIP trunks, select your trunk, and copy the SIP username and SIP password. You'll enter these in the outbound section.
  • Inbound: No SIP credentials are needed — leave the inbound username and password empty. If your security policy requires allowlisting, email support@telxi.com to whitelist the relevant IPs.
2

Go to Phone Numbers

In the ElevenLabs Agents dashboard, open the Phone Numbers section and click Import a phone number from SIP trunk. See the ElevenLabs SIP trunking docs for reference.

3

Basic configuration

  • Label: a descriptive name (e.g. Telxi).
  • Phone Number: your number in E.164 format, without the leading plus (e.g. 15551234567).
Keep the format consistent: if you import the number without a +, calls to the ElevenLabs SIP URI must also use the number without a +. Mismatched formats prevent call routing.
4

Inbound configuration

This controls how calls coming from Telxi reach ElevenLabs.

  • SIP username: leave empty.
  • SIP password: leave empty.
  • Media encryption: Disabled.
  • Transport: TCP.
  • Address / Domain: sip.telxi.com.
5

Outbound configuration

This controls how ElevenLabs dials out through Telxi. Same settings as inbound, but credentials are required.

  • SIP username: required — your Telxi SIP username.
  • SIP password: required — your Telxi SIP password.
  • Media encryption: Disabled.
  • Transport: TCP.
  • Address / Domain: sip.telxi.com.
6

Import, assign an agent, and test

  1. Click Import to finalise the configuration.
  2. Select your imported number and click Assign Agent, then choose the agent that should handle its calls.
  3. Inbound test: call your Telxi DID from any phone — it should reach your ElevenLabs agent.
  4. Outbound test: place an outbound call from the agent and confirm it routes through Telxi.

Troubleshooting

SymptomLikely causeWhat to check
Outbound call fails to authenticateWrong or missing credentialsRe-copy the SIP username/password from portal.telxi.com → SIP trunks into the outbound section.
Inbound call doesn't connectAddress or transport mismatchConfirm the address is sip.telxi.com and transport is TCP on both sides.
Call routing failsNumber format mismatchImport the number and dial it with the same format (here, no leading +).
No audio / one-way audioMedia or NAT issueKeep media encryption Disabled on both sides; confirm a common codec (G711/G722).
Connection issuesFirewall on TCP 5060Allow SIP signalling on TCP port 5060; confirm sip.telxi.com is reachable.

Reference