Hello Support, I've set up a BYO SIP trunk. Calls from VAPI to me sometimes work. But to Vapi, no luck. I have an AudiCodes SBC connected to our PBX. Do you have an example of what the SIP protocol to Vapi with authentication should look like? So that I can then call my assistants! Best regards Rainer

@Rainer Sending calls to VAPI from an AudioCodes SBC may not be possible at all, as the way that VAPI implements the challenge/response may differ from what AudioCodes SBC is capable of providing in the setup. You are welcome to contact me via a DM and we can examine it. At most, you'll be able to build this connection via the Cloudonix platform as well.

Hey @Nir Simionovich (CEO@Cloudonix) thanks for helping @Rainer

@ Nir S (CEO/Founder @Cloudonix) thanks for helping. I think you can do that with AudioCodes. If it doesn't work, I'd be happy to take up the offer again! @Shubham Bajaj No, the problem still exists! Is there an example of what the SIP invite for the call should look like? Then I can try to configure the SBC so that it works.

Hey Rainer, can you book a quick call with team?

SIP Call Issue – Inbound Going to Voicemail, Outbound Call Tool Not Found Hey everyone — I’m setting up SIP integration for my voice agent using Vapi and running into two key issues: ❌ What’s Happening: 1. Inbound calls to my SIP number are going to voicemail — they’re not reaching my voice agent 2. Outbound calls are failing with this error: "Outbound Call Failed. Couldn't Get Tool, toolid [some_tool_id] Does Not Exist." ✅ What I’ve Done: Integrated a SIP trunk from a local Caribbean provider Used standard settings (UDP, PCMU/PCMA codecs, RFC2833 DTMF) Created a voice agent and assigned the SIP connection Double-checked auth, domain, and credentials (all correct) 🧠 Questions: What might cause inbound calls to skip Vapi entirely? What does the “Tool ID does not exist” error mean? Is it related to a missing config or voice agent? Appreciate any help or direction! – Andre

@Sahil Hello, Thanks for the offer. That won't help unless you have a translator in German. Since I only speak German natively. Sorry!

hey @[axespire_57158](https://app.plain.com/workspace/w_01HYEQ5FKPH8CPX2MS608B6S51/customers/c_01JY4T1BSJAT3RTH9H0K2Y4V4B/) please create a new support ticket for your issue.