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Node.JS SIP Registrar
var sip = require('sip');
var sys = require('sys');
var redis = require('redis');
//Trim leading and trailing whitespace from string values.
function trim(str) {
return str.replace(/^\s+|\s+$/g, '');
}
sip.start({},function(request) {
try {
// Parse the URI in the reuqest header.
var address = sip.parseUri(request.headers.to.uri);
// Create a redis client to manage the registration
// info.
var client = redis.createClient();
// Handle SIP Registrations.
if (trim(request.method) == 'REGISTER') {
var contact = request.headers.contact;
// Store the registration info.
if (Array.isArray(contact)
&& contact.length
&& (+(contact[0].params.expires
|| request.headers.expires || 300)) > 0) {
sys.puts('Registering user ' + request.headers.to.name + ' at ' + contact[0].uri);
client.set(address.user, contact[0].uri);
}
// Remove the registration info.
else {
sys.puts('Logging off user ' + request.headers.to.name);
client.del(address.user);
}
// Build the response.
var response = sip.makeResponse(request, 200, 'OK');
// Send the response to the SIP client
sip.send(response);
}
// Handle SIP Invites.
if (trim(request.method) == 'INVITE') {
sip.send(sip.makeResponse(request, 100, 'Trying'));
// Look up the registration info. for the user being
// called.
address = sip.parseUri(request.uri);
client.get(address.user, function(err, contact) {
// If not found or error return 404.
if (err || contact === null) {
sys.puts('User ' + address.user + ' is not found');
sip.send(sip.makeResponse(request, 404, 'Not Found'));
}
// Otherwise, send redirect with contact URI.
else {
sys.puts('User ' + address.user
+ ' is found at ' + contact);
var response = sip.makeResponse(request, 302, 'Moved Temporarily');
response.headers.contact = [ { uri : contact } ];
sip.send(response);
}
});
}
// Close the Redis client
client.quit();
}
// Handle exceptions.
catch (e) {
sip.send(sip.makeResponse(request, 500, 'Internal Server Error'));
sys.debug('Exception ' + e + ' at ' + e.stack);
}
});
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