You could use some Kemi/Javascript function to do the conversion, though, I
don't think you will benefit much from doing that conversion and back....
here is a Kemi JS function that converts SIP headers to JSON structure. It
is called using app_jsdt module.
Modify it at will to do whatever you want .
// converts SIP headers to JSON object, supporting repeated headers
(converts to Array of strings)
// and also support any custom SIP headers
function headers_to_json() {
try {
var raw = KSR.pv.get("$mb") || "";
var headers = {};
var displayKeyFor = {}; // canonicalLower -> chosen display name
(preserves first-seen casing)
// Split full SIP message into lines and isolate the header section
var lines = raw.split(/\r\n|\n/);
var startLine = (lines.length > 0) ? lines[0] : "";
var i = 1; // start after Request/Status line
var headerLines = [];
var current = null;
// Reconstruct logical header lines (handle obsolete line folding:
lines starting with SP/HTAB)
for (; i < lines.length; i++) {
var line = lines[i];
// End of header section (blank line before message body)
if (line === "") {
break;
}
if (line.length > 0 && (line.charAt(0) === ' ' ||
line.charAt(0) === '\t')) {
// Continuation of previous header
if (current !== null) {
// Trim leading whitespace on the continuation and join
with a single space
current += " " + line.replace(/^\s+/, "");
}
} else {
// New header starts
if (current !== null) headerLines.push(current);
current = line;
}
}
if (current !== null) headerLines.push(current);
// RFC 3261 compact form expansions (common ones)
var compactMap = {
"i": "Call-ID",
"m": "Contact",
"e": "Content-Encoding",
"l": "Content-Length",
"c": "Content-Type",
"f": "From",
"s": "Subject",
"t": "To",
"v": "Via",
"k": "Supported"
};
function titleCaseHeader(name) {
var parts = name.split("-");
for (var j = 0; j < parts.length; j++) {
var p = parts[j];
if (p.length > 0) {
parts[j] = p.charAt(0).toUpperCase() +
p.slice(1).toLowerCase();
}
}
return parts.join("-");
}
function canonicalName(name) {
var n = (name || "").trim();
var low = n.toLowerCase();
if (compactMap.hasOwnProperty(low)) return compactMap[low];
// For all other headers (standard or custom), create a nice
Title-Case key
return titleCaseHeader(n);
}
// Build JSON object: single occurrence -> string; multiple
occurrences -> array of strings
for (var h = 0; h < headerLines.length; h++) {
var l = headerLines[h];
var idx = l.indexOf(":");
if (idx < 0)
continue; // skip malformed lines (shouldn't happen in
valid SIP)
var nameRaw = l.substring(0, idx);
var value = l.substring(idx + 1).replace(/^\s+/, ""); // trim
leading spaces after colon
var name = nameRaw; //canonicalName(nameRaw);
var keyLower = name.toLowerCase();
var outKey = displayKeyFor[keyLower] || name;
if (headers.hasOwnProperty(outKey)) {
// Already seen: ensure it is an array and append
if (Object.prototype.toString.call(headers[outKey]) ===
"[object Array]") {
headers[outKey].push(value);
} else {
headers[outKey] = [headers[outKey], value];
}
} else {
headers[outKey] = value; // first occurrence
-> string
displayKeyFor[keyLower] = outKey; // remember chosen
display name
}
}
// Convenience fields (optional)
var method = KSR.pv.get("$rm");
if (method)
headers.Method = method;
var ruri = KSR.pv.get("$ru");
if (ruri)
headers["Request-URI"] = ruri;
var json_str = JSON.stringify(headers);
KSR.pv.sets("$var(headers_json)", json_str);
return 1;
} catch (e) {
KSR.log("error", "Failed to convert headers to JSON: " +
e.toString() + "\n");
return -1;
}
}
Atenciosamente / Kind Regards / Cordialement / Un saludo,
*Sérgio Charrua*
*www.kahea.ai <http://www.kahea.ai> / www.voip.pt <http://www.voip.pt>*
*OpenTelecom* - Consulting for Telecoms, Lda
Tel.: +351 <callto:+351+91+104+12+66>91 631 11 44
Email : *[email protected] <[email protected]>*
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On Thu, Feb 5, 2026 at 10:08 AM 13715209697--- via sr-users <
[email protected]> wrote:
> Hi, Alex Balashov
>
> You are right; I made a mistake.
>
> Configure the following parameter under the FreeSWITCH SIP Profile:
>
> <param name="enable-compact-headers" value="true"/>
>
> I hope Kamailio can expand compact-headers into normal SIP headers.
> Currently, it seems Kamailio can only relay them as-is.
> __________________________________________________________
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