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Phone Transfers Not Working

Hello, I have been working on the transfers for two days, but I haven't been able to make them work. Part of the tests I’ve conducted were with two different assistants. One has a phone number configured with Telnyx and can make both inbound and outbound calls without issues. The other assistant has a free number from VAPI, and both assistants use different tools for call transfers.

When testing outbound calls with Telnyx, the number is dialed differently, so the numberE164CheckEnabled option is disabled. I did this because I tested the transfers using both the E164 format and a prefix to rule out this as the issue.

On the other hand, the assistant with the VAPI number also cannot make the transfer work. In both cases, I hear the message the assistant is supposed to say, but a few seconds later, the call ends. When reviewing the logs, I don’t find any errors. The last action I can see is that the transfer was completed, but the destination number never rings.

Please, I have an application that we want to publish in a few weeks, and this is an essential function for the project.

Timestamp | Call ID outbound using telnyx
2025-03-13 17:39:53 PDT | 87076f07-3e85-498b-a0ea-a4dc9f3d8894

Timestamp | Call ID inbound usign telnyx
2025-03-13 16:17:22 PDT | a44899b8-c29c-4be7-8951-6010fe8381f2
2025-03-13 15:53:51 PDT | f8c42603-894f-49ce-8545-f5598ba69a38
2025-03-13 15:43:21 PDT | 8c40bff0-1fe0-4886-9571-08fabf783069
2025-03-13 14:28:00 PDT | 2ac0ac11-8222-4468-ba56-fe2cc61d9b02
2025-03-12 14:31:19 PDT | 4ee3a729-39bd-4382-a394-0fce28adb8b6

Timestamp | Call ID outbound using Vapi Number:
2025-03-13 16:28:23 PDT | d002ab94-26a2-4a7b-855c-ef19196bfe6c
2025-03-13 16:24:41 PDT | 3b26172b-9983-4a9f-b0c7-093f3b22d48c
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