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Telnyx SIP Inbound Settings: Translate Number
# support
w
I've been followingL https://docs.vapi.ai/advanced/sip/telnyx. I've set up Outbound calling with Telnyx however I cannot finish setting up Inbound calling for my Telnyx number. Happy to jump on a call to resolve this one. When trying to follow these instructions:
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Configure SIP invite
Go to Numbers, edit the number you’ll be using
Navigate to Voice settings
Scroll down to find “Translated Number”
Set this value to match your Vapi SIP URI
You can get your Vapi SIP URI when you create a new SIP number through the Phone Numbers tab in the Vapi dashboard. The URI will look like:

sip:<your-unique-id>@sip.vapi.ai
This setting modifies the SIP Invite so invites are correctly routed to your Vapi SIP URI.
I have attached a screenshot of the Telnyx UI, showing that a number is required. I cannot put any characters or symbols in there because of the form validation preventing me. I have also tried via API with the same issue:
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Response: {"errors":[{"code":"10015","title":"Bad Request","detail":"Must contain only letters and numbers; no spacing allowed","source":{"pointer":"/translated_number"},"meta":{"url":"https://developers.telnyx.com/docs/overview/errors/10015"}}]}
https://cdn.discordapp.com/attachments/1402670221826723973/1402670222007205888/image.png?ex=6894c1f1&is=68937071&hm=c0b7110635c0f881d7e2fd900bd857b565e1bfd6589c0b98b4253168641b9b50&
v
It appears that Telnyx's "Translated Number" field currently only accepts alphanumeric input, which prevents entering the required SIP URI (
sip:<your-unique-id>@sip.vapi.ai
) as described in the Vapi documentation. The best next step is to contact Telnyx support and reference error code 
10015
, asking if there is an alternative way to route SIP invites to your Vapi SIP URI or if a different field should be used for SIP trunking with Vapi. In the meantime, double-check if there is a "SIP URI" or "Forwarding" field elsewhere in the Telnyx portal that allows full SIP addresses, as some platforms separate these from the "Translated Number" field. If you receive updated guidance from Telnyx, please share it here for others facing the same issue. Source: - [Telnyx SIP Integration Guide – Vapi Documentation](https://docs.vapi.ai/advanced/sip/telnyx)
w
i've found a few threads with the same issue that have been resolved on a call. Unofrtunately, no solution on the threads itself though
c
Hey! To help track down this issue, could you share: - The call ID - This would really help us figure out what went wrong!
w
Sorry, there is no callId that is relevant because it doesn't reach vapi, this is a setup issue
j
Hi. I'm having the same issue. When you know the solution or me post here pls
c
Please can you share a loom video, so to assist you easily ..
j
When is possible to do a call to solve this?
c
Checking if this is resolved/solved for you?
j
not yet
c
When configuring the SIP trunk in Vapi, please try and enable SIP register box, which will have the username that will be used for the URI in alphanumeric characters. Let us know if you need help configuring this
j
https://vapi.ai/community/m/1375113468457386114 Maybe the problem is connected with this?
c
In the domain, make sure you follow this guide if you are creating a SIP trunk for Telnyx: Use this template as a guide to configuring both inbound and outbound gateways. The inbound gateway will need a static IP address and the outbound gateway will use the resolved domain name using UDP protocol:
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{
  "provider": "byo-sip-trunk",
  "name": "My SIP Trunk",
  "gateways": [
    {
      "ip": "sip.provider.com",
      "port": 5060,
      "outboundEnabled": true,
      "inboundEnabled": false,
      "outboundProtocol": "udp"
    },
    {
      "ip": "203.0.113.10",
      "port": 5060,
      "outboundEnabled": false,
      "inboundEnabled": true
    }
  ]
}
Once you have configured the SIP trunk, you will receive a value for credentialId. Save that and use it for the next step of assigning the SIP trunk to a phone number, as that is a required value for setting up the phone number. If you encounter any issues with the setup, please feel free to reach out.
j
I have tried didn't worked... :/ It is to follow the same steps until step 4 (https://docs.vapi.ai/advanced/sip/telnyx#add-your-telnyx-sip-credentials-to-vapi) where I've put the text code above?
c
We are currently testing the telnyx phone import with our own account. Once we resolve it, we will provide an update to you on how to connect it
m
is there any status?
c
Hello, We sincerely appreciate your understanding and apologize for the inconvenience this has caused. Our team is currently investigating the matter to determine the root cause and implement a resolution as quickly as possible. We will provide you with updates as soon as new information becomes available, and we remain committed to ensuring this issue is fully resolved
Hey just a quick update, we are actively testing out the telnyx account and the connections. Once we establish a working connection, we will reach back out to you. Thank you for your patience
m
Any news on this?
Most people are probably looking at this thread because the native Telnyx number import doesn't provide usable audio quality (https://discord.com/channels/1211482211119796234/1366869224798031953) - when will there be a fix?
c
Hello, We sincerely appreciate your understanding and apologize for the inconvenience this has caused. Our team is currently investigating the matter to determine the root cause and implement a resolution as quickly as possible. We will provide you with updates as soon as new information becomes available, and we remain committed to ensuring this issue is fully resolved
m
Any news?
c
Hello we really appreciate your patience with us and we will be with you as soon as possible
k
Any news yet, we have same problem
c
To set up Telnyx, go into your Telnyx dashboard into: Real-Time Communications > Voice > Programmable Voice > Voice API Applications > Create Voice App Then set up the following: Webhook URL 
https://api.vapi.ai/telnyx/inbound_call
Failover URL 
https://api.vapi.ai/telnyx/inbound_call
Anchorsite 
Latency
DTMF Type 
RFC 2833
Once those values are entered in, assign your phone number in the phone number tab on Telnyx. Lastly, import your phone number through the Phone Numbers page on VAPI dashboard. Please ensure that your Telnyx API key has been entered into the integrations page before performing this step. Create phone number with the Telnyx tab, enter your phone number from Telnyx that is connected with Voice API Applications, then click save. If you need further assistance with this, please let us know.
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