Hi there! Sorry to hear you're experiencing issues with your outbound call quality through Telnyx.
While I can't pinpoint exactly why your outbound calls sound worse than inbound calls in your specific setup, I can definitely help with several potential solutions to improve your outbound call quality.
Here are some things you can try to improve your outbound call quality with Telnyx:
### Telnyx-Specific Settings
1.
Enable Telnyx's Built-in Denoiser - Telnyx has a built-in denoiser feature that can be enabled on their end, which can potentially solve voice quality issues. [According to our documentation](
https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1337367225384046634), this can make a significant difference.
2.
Adjust Outbound Voice Profiles - In Telnyx, navigate to voice/outbound voice profiles to create a profile, name it, allow desired destinations, and assign the desired SIP trunk. [This can help optimize your call routing](
https://docs.vapi.ai/advanced/sip/telnyx).
3.
Country Selection for Outbound Calls - In the Outbound tab of Telnyx, select the country you'll be calling the most. It's recommended to create a separate SIP Trunk for each country you aim to make the most calls to for better quality. [This is mentioned in our Telnyx integration guide](
https://docs.vapi.ai/advanced/sip/telnyx).
### Codec Settings
4.
Check Codec Compatibility - Ensure that the codecs used by Vapi (PCMU/8000, PCMA/8000, opus/48000/2) are supported by your SIP endpoint. [According to our documentation](
https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336713212233515089), codec incompatibility can cause quality issues.