support voip carrier sip proxy (#165)

* support voiip carrier sip proxy

* wip

* wip

* wip

lib/utils.js

@@ -323,6 +323,18 @@ const makePartnerFullMediaReleaseKey = (callId) => {
   return `a_sdp:${callId}`;
 };
 
+function isValidDomainOrIP(input) {
+  const domainRegex = /^(?!:\/\/)([a-zA-Z0-9.-]+)(:\d+)?$/;
+  // eslint-disable-next-line max-len
+  const ipRegex = /^(?:(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(:\d+)?$/;
+
+  if (domainRegex.test(input) || ipRegex.test(input)) {
+    return true;
+  }
+
+  return false; // Invalid input
+}
+
 module.exports = {
   makeRtpEngineOpts,
   selectHostPort,
@@ -336,5 +348,6 @@ module.exports = {
   isPrivateVoipNetwork,
   isBlackListedSipGateway,
   makeFullMediaReleaseKey,
-  makePartnerFullMediaReleaseKey
+  makePartnerFullMediaReleaseKey,
+  isValidDomainOrIP
 };