unable to transfer call, call get disconnected
# supporth
Harry
04/03/2025, 11:51 PMcall id > b3b4f57e-f482-4d56-ae2f-a1eb809586d0, unable to transfer call, call get disconnected #1211483291191083018
v
Vapi Support Bot
04/03/2025, 11:53 PMHi there! I see you're having an issue with a call transfer that's resulting in disconnection 📞
I won't be able to tell you the exact cause for your specific call ID without examining the actual logs, but I can definitely help with common causes and troubleshooting steps for this type of issue.
### Common Causes for Call Transfer Disconnections
There are several potential reasons why call transfers might fail and result in disconnection:
1. **SIP System Configuration Issues**: According to [information I found](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334919245468799007), configuration problems on the SIP system, network issues, or compatibility problems between the VAPI transfer method and your SIP system can cause immediate disconnections after transfer attempts.
2. **Web Call Limitations**: If you're using web calls, this could be the issue. [Documentation shows](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1337162299621900359) that "You cannot do phone call transfers on web call. If you do phone call transfers on web call then it won't work."
3. **Destination Number Issues**: The transfer might fail if the [destination number is busy, out of reach, or unreachable](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1339614362742165606) due to international restrictions.
4. **Call Control Server Message**: If the call control server message isn't disabled on the assistant, this can [cause transfer failures](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1339614362742165606).
5. **Twilio Routing Issues**: If you're using Twilio, the routing region might be incorrect. Some users have resolved issues by [changing the routing in Twilio to U.S.](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1339614362742165606)
### Troubleshooting Steps
Vapi Support Bot
04/03/2025, 11:53 PMHere are some steps you can take to diagnose and potentially fix the issue:
1. Check the logs for your call ID to look for specific error messages or clues about the disconnection.
2. **Verify SIP system compatibility**: If applicable, check with your SIP system administrator if there are specific requirements for transferring calls.
3. **Ensure proper configuration**: Make sure your
forwardingPhoneNumberforwardingPhoneNumberv
Vapi
04/06/2025, 11:50 AMThank you for reaching out to us. We've received your message and will get back to you as soon as possible.
Vapi
04/06/2025, 11:56 AMHi, checking if this is resolved/solved for you?
h
Harry
04/07/2025, 3:57 AMHi shubham , not yet
v
Vapi
04/07/2025, 9:15 PM🔵 06:54:18:226 Using tool.destinations\[0\]: {
"type": "number",
"number": "+61xxxx3",
"message": "",
"numberE164CheckEnabled": true,
"transferPlan": {"mode": "blind-transfer", "sipVerb": "refer"}
}
🔵 06:54:18:250 Live Call Manager Ending...(assistant-forwarded-call)
Hey Harry,
As you can see in the shared logs, the call was forwarded successfully. I would request you to transfer a test 2-3 calls on your number to check if call forwarding is working for you or not because it has been marked successfully from our end.
Let me know how it goes for you.
h
Harry
04/08/2025, 4:33 AMThanks shubam, is there any way that we can edit the SIP trunk credentials,
As the issue is , now I won't be able to make any inbound call how ever outbound is working
Harry
04/09/2025, 3:39 AM@User call id - e8700e71-ae65-4055-89dc-d40703ae7f96
Incoming is working for this ID , however getting error for Outbound calls "An error occurred in this call: call.in-progress.error-sip-telephony-provider-failed-to-connect-call"
v
Vapi
04/09/2025, 4:38 AMlooking into it.
Vapi
04/09/2025, 4:55 AMYou have to register this number again, as you can see outbound config is incorrect.
https://cdn.discordapp.com/attachments/1357502893208506563/1359391268546940988/image.png?ex=67f74f46&is=67f5fdc6&hm=139e8a856e85b1b80e212bf0de8364dc9a18ba95740465e002ed3e80e6886b26&
k
Kings_big💫
04/09/2025, 5:10 AM@Harry
h
Harry
04/09/2025, 5:18 AMIs there any configuration file or steps, I tried configure number and SIP multiple times
k
Kings_big💫
04/09/2025, 5:21 AMh
Harry
04/09/2025, 5:23 AMThanks , will try