Telnyx calls fail
# supportm
marem
05/28/2025, 1:58 PMCallid:
438cf130-9378-43f4-8ee6-e11fa3772344v
Vapi Support Bot
05/28/2025, 1:59 PMSuggestion:
Check if any recent changes were made to your SIP trunk or webhook configurations, as misconfigurations here are a common cause of audio issues like the one you described. If possible, revert to a previous working configuration or carefully review your SIP settings for errors. If the problem persists, consider reaching out to Vapi support with your call ID and a description of the issue for further investigation.
This approach is based on similar cases discussed in the Vapi Discord community, where SIP misconfigurations were often linked to caller audio problems.
Source:
- [Vapi Discord: Outbound call not executed and no webhooks sent](https://discord.com/channels/1211482211119796234/1372358449761091584)
Vapi Support Bot
05/28/2025, 1:59 PMSuggestion:
Check if any recent changes were made to your SIP trunk or webhook configurations, as misconfigurations here are a common cause of audio issues like the one you described. If possible, revert to a previous working configuration or carefully review your SIP settings for errors. If the problem persists, consider reaching out to Vapi support with your call ID and a description of the issue for further investigation.
This approach is based on similar cases discussed in the Vapi Discord community, where SIP misconfigurations were often linked to caller audio problems.
Source:
- [Vapi Discord: Outbound call not executed and no webhooks sent](https://discord.com/channels/1211482211119796234/1372358449761091584)
m
marem
05/28/2025, 8:44 PMResponse from Telnyx support. Is this something you can fix on your side @Vapi @Shubham Bajaj ?
https://cdn.discordapp.com/attachments/1377284786099585034/1377387008510398665/image.png?ex=6838c71d&is=6837759d&hm=f6c5e02f1d330014e96e0b62b637381ea83e42347da053c62058c08c21ce981a&
v
Vapi Support Bot
05/28/2025, 8:46 PMSuggestion:
Try specifying the codec in your Vapi actions/answer request to resolve the audio issue. For example, you can attempt to set the preferred codec to PCMU as follows:
Copy code
json
{
"preferred_codecs": "PCMU,PCMA,G722"
}Vapi Support Bot
05/28/2025, 8:46 PMSuggestion:
Try specifying the codec in your Vapi actions/answer request to resolve the audio issue. For example, you can attempt to set the preferred codec to PCMU as follows:
Copy code
json
{
"preferred_codecs": "PCMU,PCMA,G722"
}Vapi Support Bot
05/28/2025, 8:46 PMAt this time, there is no documented way in Vapi to set the
stream_codecpreferred_codecsVapi Support Bot
05/28/2025, 8:46 PMAt this time, there is no documented way in Vapi to set the
stream_codecpreferred_codecsm
marem
05/28/2025, 9:12 PMv
Vapi Support Bot
05/28/2025, 9:14 PMAt this time, Vapi does not support setting the
stream_codecpreferred_codecss
Shubham Bajaj
05/29/2025, 2:20 AMlooking into it.
Shubham Bajaj
05/29/2025, 2:44 AM@marem I went through your messages. Find out this is what you are asking for, and this is what we need to change before we proceed ahead. I want to confirm this with you, and I also request you share more credible resources and information available because this is in dev chain, and don't want it to be for one of the chances to be sure before we proceed ahead.
### What I Found You're Asking For:
1. **Current Issue**: Vapi hardcodes
stream_bidirectional_codec: 'PCMU'connection_codecscall.initiatedconnection_codecsconnection_codecscall.initiatedconnection_codecscall.initiatedconnection_codecsm
marem
05/29/2025, 1:29 PM1. Telnyx Support Documentation or official guidance on codec selection best practices
I found this: https://developers.telnyx.com/docs/voice/programmable-voice/media-streaming#rtp-stream-codec
2. Sample
call.initiatedv
Vapi Support Bot
05/29/2025, 1:30 PMThank you for providing the Telnyx documentation and contact details. We will review the codec selection guidance and reach out directly to Telnyx support to ensure any changes to our audio pipeline are fully validated. Your input is very helpful for moving this issue forward. We will keep you updated as we coordinate with Telnyx and progress on a solution.
Source:
- [Telnyx Programmable Voice Media Streaming Documentation](https://developers.telnyx.com/docs/voice/programmable-voice/media-streaming#rtp-stream-codec)
Vapi Support Bot
05/29/2025, 1:30 PMThank you for providing the Telnyx documentation and contact details. We will review the codec selection guidance and reach out directly to Telnyx support to ensure any changes to our audio pipeline are fully validated. Your input is very helpful for moving this issue forward. We will keep you updated as we coordinate with Telnyx and progress on a solution.
Source:
- [Telnyx Programmable Voice Media Streaming Documentation](https://developers.telnyx.com/docs/voice/programmable-voice/media-streaming#rtp-stream-codec)
Vapi Support Bot
05/29/2025, 1:31 PMThank you for providing the Telnyx documentation and contact details.
Currently, Vapi does not support user-configurable codec selection for SIP calls via the API or dashboard, and engineering is considering a platform update to address this ([Vapi Server URL and SIP Integration Documentation](https://docs.vapi.ai/server-url/setting-server-urls)).
To help us validate the codec negotiation logic:
Could you please share a sample
call.initiatedconnection_codecsVapi Support Bot
05/29/2025, 1:31 PMThank you for providing the Telnyx documentation and contact details.
Currently, Vapi does not support user-configurable codec selection for SIP calls via the API or dashboard, and engineering is considering a platform update to address this ([Vapi Server URL and SIP Integration Documentation](https://docs.vapi.ai/server-url/setting-server-urls)).
To help us validate the codec negotiation logic:
Could you please share a sample
call.initiatedconnection_codecsv
Vapi Support Bot
05/29/2025, 1:31 PMThank you for providing the Telnyx documentation and context.
Currently, Vapi does not support setting
stream_codecpreferred_codecsconnection_codecsVapi Support Bot
05/29/2025, 1:31 PMThank you for providing the Telnyx documentation and context.
Currently, Vapi does not support setting
stream_codecpreferred_codecsconnection_codecsVapi Support Bot
05/29/2025, 1:32 PMAt this time, Vapi does not support setting the
stream_codecpreferred_codecsVapi Support Bot
05/29/2025, 1:32 PMAt this time, Vapi does not support setting the
stream_codecpreferred_codecsa
Aditya Papriwal
05/30/2025, 11:40 AM@marem1859 yeah you can add me in cc with Telnyx support directly.
m
marem
06/02/2025, 4:02 PM@Shubham Bajaj let me know if you have some news from Telnyx support please
https://cdn.discordapp.com/attachments/1377284786099585034/1379128071805735035/image.png?ex=683f1c9b&is=683dcb1b&hm=1c91e0dd24c48a88c6205e66433d5ebc71238be2d88ad0fe848b0190b7b9a8f9&
a
Aditya Papriwal
06/03/2025, 7:08 PMHey @marem, thanks for cc'ing me in the email. I will look at it later, verify it within our codebase, check with the team, and then let you know the next steps and the ETA for the changes.
m
marem
06/06/2025, 1:23 PMHi @Shubham Bajaj did you manage to reach Telnyx support about this issue?
a
Aditya Papriwal
06/09/2025, 7:18 PMHey @marem, there's no confirmation from the Telnyx team in the email thread, so I can't proceed with your requests. can you directly ask the questions in the above thread to the Telnyx team and let me know their response.?
m
marem
06/10/2025, 1:05 PMSorry but I don't know how can I can do more. I have no reply from Telnyx since.
Vapi Telnyx integration is not functional for Europe users. Period.
Why don't you reach the support yourself? I am not owner of this feature, It would be much easier than having me in the middle reporting the issue on both sides with no way to fix it.
If you don't want to support it, then add a disclaimer somewhere in the app so that users uses another phone provider.
s
Shubham Bajaj
06/10/2025, 9:57 PM> If you don't want to support it, then add a disclaimer somewhere in the app so that users uses another phone provider.
>
REFERENCE:
a
Aditya Papriwal
06/10/2025, 10:01 PMHey, first of all, if I or our team never wanted to support this, there was no reason for me to check the codebase against your claims and validations. Find out what needs to be done, how it needs to be done, and what will be the score for work. But I did because we want to do it for you.
We have a process to follow with different teams when it comes to integration - respect their boundaries. If I don't get a reply within a day, I reach out to them directly. That's my process. I'm in direct connection with them, I'll reach out, share all of the documentation and resources for their better understanding.
Coming to another point where you are mentioning that it's not functional for Europe users. I don't think it's functionally or technically true. If that was the case, all of Europe users would have reached out to us. But honestly, we have received a single complaint from you only (as a power user), and taking your complaint seriously, I'm working on it. If it was something which we had to ignore, I could have done it easily, but that's not the case, I believe so.
So I'll do the follow-up from here onwards, and I'll let you know the update soon.
m
marem
06/10/2025, 10:16 PM> Coming to another point where you are mentioning that it's not functional for Europe users. I don't think it's functionally or technically true. If that was the case, all of Europe users would have reached out to us. But honestly, we have received a single complaint from you only (as a power user)
Hard to make a generality out of it, but there is another complaint about the exact same issue: https://discord.com/channels/1211482211119796234/1372606009595658352
Thanks for taking it seriously and sorry if you felt offended.
It's quite frustrating on my side because I have no idea of current implementation so I'm just reporting to you what telnyx says and vice versa.
a
Aditya Papriwal
06/11/2025, 11:10 PMHey, thanks for sharing this thread. I'll look into it. I didn't mean I feel offend. I was just expressing my thoughts similar as you have done. We're all in this together, so everything's fine. We are here to work collaboratively to achieve our goals. My goal is to help you and ensure everything works for you.
m
marem
06/22/2025, 9:01 PMs
Shubham Bajaj
06/23/2025, 10:27 AMHey there, thanks for reaching out. We will get to this issue after resolving the current Telnyx problem for some other customer. Once that's done, I'll outline the necessary changes for our team's reference, and we'll proceed to fix it next.
Shubham Bajaj
06/23/2025, 10:29 AM@marem Just to let you know, you are an important customer for us. We genuinely appreciate your usage of VAPI.
m
marem
06/25/2025, 12:53 PMOk thanks @Shubham Bajaj . Do you have an ETA for this? Do you know if it's a matter of 1 week? 1 monh?
a
Aditya Papriwal
06/26/2025, 6:30 AMSorry, but we don't any timeline which we can share with you at the moment. We are trying our best to get it resolved asap.
s
Shubham Bajaj
06/30/2025, 3:25 AM@marem , I apologize, but I can't provide you with a timeline at the moment. I need to get some commitments and proper communications first.
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