Voice agents fill transfer SIP headers during the call

A transfer's custom SIP headers give the phone system that receives the call some context, such as a customer ID or a summary of the conversation. Now the agent itself can write those values, at the moment it transfers the call.

How it works

Any variable in a transfer's Custom SIP Headers whose name ends in -transfer, such as {{call_summary-transfer}}, is filled in by the agent when it transfers, from what was said in the call. It adds no delay to the transfer.

1. Open your voice agent's Transfer Call action.
2. Under Custom SIP Headers, click Add, type the header name and, in Value, a variable such as {{call_summary-transfer}}.
3. Optional: tell the agent what to write. Add a line to its prompt with the variable, a colon and your instruction, for example: {{call_summary-transfer}}: a one-line summary of what the caller needs.

• Test calls no longer ask you for these values.
• The value is a single line of plain text.
• If the call starts with a dynamic variable of the same name, that value is used instead.

Action needed if you send the call summary

If one of your headers uses {{call_summary_transfer}}, with an underscore before transfer, rename it to {{call_summary-transfer}}, with a hyphen. The old name is no longer filled in, so the summary would arrive empty.