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Telnyx connects your numbers to Bolna through a SIP connection. The connection sends calls to your numbers into Bolna and checks the calls Bolna places. An Outbound Voice Profile attached to it sets where those calls can go.

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Before you begin

  • A Telnyx account and at least one Telnyx phone number. Telnyx needs Level 2 verification before many outbound destinations can be enabled.

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Set up Telnyx

1

Create an FQDN SIP connection

In the Telnyx Mission Control Portal, open Voice Suite → SIP Trunking and click Create SIP Connection. The wizard has these pages: Details, Authentication and routing, Configuration, Inbound, Outbound and Numbers. Click Next to move between them. Enter a name, for example Bolna, and select FQDN as the connection type.
2

Add Bolna's address and outbound credentials

On Authentication and routing, click Add FQDN and enter:On the same page, set outbound calls authentication to Credentials and set a username and password. Save both, because you enter them in Bolna.
Include your connection username in the first INVITE. To make sure your calls are authenticated correctly and your connection’s AnchorSite® preference is honored, include the connection’s SIP username in the user part of the Contact header in the initial SIP INVITE. If that’s not supported, include it in the custom SIP header X-Telnyx-Username. Learn more
3

Set the inbound options

On Inbound:
  • SIP region: pick a region and note it. It starts empty. Telnyx sends inbound calls from that region’s two IP addresses, and you add them in Bolna.
  • SIP transport protocol: leave it at UDP or set TCP. Bolna does not accept TLS.
  • Destination number format: leave it at E.164 or set +E.164. Bolna matches both.
  • Codecs: Telnyx turns on G722, G711U, G711A and G729 by default. Turn off G722 and G729 so only G711U and G711A remain. Bolna accepts PCMU and PCMA only.
4

Attach an Outbound Voice Profile

On Outbound, pick a profile under Outbound voice profile, then finish the wizard. To create a profile or change where it can call, open Voice Suite → Outbound Voice, click Create Profile or open an existing profile, and under Allowed Destinations turn on the countries your agent calls.
5

Assign your numbers

Open Voice Suite → Phone Numbers → My Numbers. For each number you want on Bolna, pick the connection in the Connection/Application column and save.

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Create the trunk in Bolna

1

Pick Telnyx

In the sidebar, under Deploy, open SIP Trunks and click Create trunk. If your account still has legacy SIP trunks, click Open new SIP trunks first. On the Provider step, pick Telnyx and enter a Trunk name and the number of Channels. The preset fills in Gateway we dial with sip.telnyx.com on port 5060 and uses TCP. You can change the gateway, port and transport on the trunk’s Connection tab later, and the channel count under Connection → Advanced. Click Continue.
2

Add Telnyx's IPs and credentials

On the Carrier IPs step, add the two IPs of the SIP region you picked on the connection’s Inbound page. Telnyx publishes them:Under Carrier credentials (optional), enter the Username and Password you set on the Telnyx connection. Click Continue.
3

Add your Telnyx numbers

On the Numbers step, enter each Telnyx number in E.164 format, for example +14155550100, and click Add. Click Continue, check the summary and click Create trunk.
4

Turn on Dial with leading plus

Telnyx accepts called numbers in +E.164 format by default. Open the trunk’s Connection tab and, under Outbound: gateways, turn on Dial with leading plus.
The caller ID on an outbound call must be a valid number; Telnyx rejects an invalid one with 403 Caller Origination Number is Invalid D35. Use a Telnyx number on your account. For every field on these steps, see Connect your carrier.

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Assign an agent and test

  • Inbound: open the trunk’s Numbers tab and, in the Agent column, pick an agent for your Telnyx number. Then call the number. See Receive inbound calls.
  • Outbound: on the agent’s Calling tab, set Telephony Provider to SIP Trunk. Click Get a call from agent, pick your Telnyx number under Call from, enter the number to call under Your phone number and click Place call. See Make outbound calls.
If a call does not connect, see Troubleshooting.