ZADARMA SIP FAILED
# supportr
ruanrodrigues.rn
08/08/2025, 4:08 PMWe’re trying to integrate Zadarma PBX (pbx.zadarma.com) with VAPI for a hotel reception system currently in production. SIP extension and virtual number are fully configured and forwarding to @sip.vapi.ai. IPs are whitelisted on both sides. Backend system is fully functional.
What we’ve done:
✅ Followed Zadarma integration docs
✅ SIP forwarding works from Zadarma
✅ API requests sent with proper credentials
✅ Tried both sip.zadarma.com & pbx.zadarma.com
✅ Tested with/without SIP registration
✅ Correct extension format used (153150-108)
✅ All required IPs unblocked
Errors:
Couldn't validate SIP trunk credential
credentialId must be a UUID (on phone number creation)
Problem:
Zadarma had to temporarily block VAPI IPs due to failed connection attempts. They confirmed config is correct. Still, SIP trunk fails to validate no matter what we try.
This is not an isolated case:
Multiple devs on forums and Discord report identical Zadarma issues. Seems like a broader compatibility problem.
This is urgent. We are blocked from launching for a paying hotel client. Please help us resolve this ASAP.
Request:
Manual SIP credential setup on your end
Review Zadarma compatibility
Escalate to engineering if needed
https://cdn.discordapp.com/attachments/1403409653198618906/1403409653806665880/Screenshot_2025-08-08_at_17.48.10.png?ex=68977297&is=68962117&hm=cd34e39208835e0c6e3b55aeb6a95c651afb394713534a7e3cb0d311f24e9b69&
v
Vapi Support Bot
08/08/2025, 4:10 PMActionable Suggestion:
Double-check that you are using the exact
id Copy code
bash
# Step 1: Create SIP credential (save the returned "id")
curl -L 'https://api.vapi.ai/credential' \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer YOUR_PRIVATE_KEY' \
-d '{
"provider": "byo-sip-trunk",
"name": "Zadarma Trunk",
"gateways": [{ "ip": "sip.zadarma.com" }],
"outboundLeadingPlusEnabled": true,
"outboundAuthenticationPlan": {
"authUsername": "YOUR_SIP_NUMBER",
"authPassword": "YOUR_SIP_PASSWORD"
}
}'
# Step 2: Use the returned "id" as "credentialId" in the phone number creation
curl -L 'https://api.vapi.ai/phone-number' \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer YOUR_PRIVATE_KEY' \
-d '{
"provider": "byo-phone-number",
"name": "Zadarma Number",
"number": "YOUR_VIRTUAL_NUMBER",
"numberE164CheckEnabled": false,
"credentialId": "YOUR_CREDENTIAL_ID"
}'YOUR_CREDENTIAL_IDr
ruanrodrigues.rn
08/11/2025, 7:34 AMPlease help me
ruanrodrigues.rn
08/11/2025, 1:01 PMDoesn’t works
c
Chiranjeet Mishra
08/12/2025, 6:33 AMHi, I'll check in with our team and update you soon.
r
ruanrodrigues.rn
08/12/2025, 12:09 PMokay
c
Chiranjeet Mishra
08/13/2025, 10:50 PMTo address the invalid credentials error while connecting Zadarma's phone number to Vapi, please follow these steps:
1. **Verify Zadarma Credentials**: Ensure that the SIP number, username, and password are correctly entered. Use the server address
[sip.zadarma.com](http://sip.zadarma.com)
for SIP trunk configuration.
2. **API Request Configuration**: Execute the correct API call for adding your Zadarma SIP credentials:
Copy code
curl -L 'https://api.vapi.ai/credential' \
-H 'Content-Type: application/json' \
-H 'Authorization: Bearer YOUR_VAPI_PRIVATE_KEY' \
-d '{
"provider": "byo-sip-trunk",
"name": "Zadarma Trunk",
"gateways": [
{ "ip": "sip.zadarma.com", "inboundEnabled": false }
],
"outboundLeadingPlusEnabled": true,
"outboundAuthenticationPlan": {
"authUsername": "YOUR_SIP_NUMBER",
"authPassword": "YOUR_SIP_PASSWORD"
}
}'g
GauravSingla
08/18/2025, 1:52 AMi am creating zadarma sip in vapi thrugh the "SIP Trunk Credentials" > configure new sip trunk
GauravSingla
08/18/2025, 1:53 AMthere i have provided zadarma credentials but i keep getting error -
https://cdn.discordapp.com/attachments/1403409653198618906/1406818260283818105/image.png?ex=68a3d91a&is=68a2879a&hm=e54dee3ff52d061410fefa2bc8f18633402f39ec8a282450e3551109676a477d&
GauravSingla
08/18/2025, 1:53 AMcan someone help me
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