I already succeed to create SMS send tool with Telnyx API Now, I used this in my agent prompt like this If the caller wants to send SMS, send an SMS using the

telnyx_sms_tool

with the phone number *+1234567890 * as the recipient and the message "Hello from VAPI Telnyx" as the text. My Question: How can I get current caller 's phone number in

System Prompt

? I want to replace *+1234567890 *

Use the dynamic variable {{customer.number}} in your system prompt to automatically get the caller’s phone number and replace the fixed number when sending SMS via your telnyx_sms_tool.

Thank you very much. Issue is solved