To ensure the reply in failure_route[ID] uses the correct "to tag" from
previous SIP messages, you need to manually add the "to tag" parameter from the
180 Ringing or other related responses. Since uac_replace_to() doesn't work in
failure_route, you can use the $ct variable to access and modify the "To"
header. Here's an example:
failure_route[ID] {
# Extract the to-tag from the previous response (e.g., 180 Ringing)
$avp(to_tag) = $(ct{uri.param,tag});
# Process and send a reply with the extracted to-tag
append_to_reply("To: $ct{uri.param.tag}\r\n");
t_send_reply(486, "Busy Here");
}
Make sure you adjust the script according to your specific requirements and the
context of your SIP message handling.
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