I am trying to send a SIP CANCEL message using the t_uac_send() function from the tm module to cancel an INVITE message that was sent previously.

`$var(requestHeaders) =
"Via: " + $var(via) +"\r\n"
"To: sip:1010@172.16.100.76:6060;tag="+$var(tt)+"\r\n"
"From: sip:rvrbt@172.16.100.76:6060;tag="+$var(ft)+"\r\n"
"Call-ID: " + $ci + "\r\n"
"CSeq: 1 CANCEL\r\n"
"Max-Forwards: 62\r\n";

t_uac_send("CANCEL", "sip:1010@172.16.100.76:6060", "", "",
"$var(requestHeaders)",
"");`

I am encountering an issue where an additional Via header with a newly generated branch parameter is being added to the top of the headers.
This behavior causes the CANCEL request to not be recognized as part of the existing transaction and I get "SIP/2.0 481 Call/Transaction Does Not Exist"

Logs and Debugging Information:
Include relevant logs here, such as the generated CANCEL request and the 481 response.
cancleWithExtraViaHeader.zip

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