diff --git a/lib/utils.js b/lib/utils.js
index f8f1712..c957ae2 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -195,7 +195,7 @@ const isPrivateVoipNetwork = async(uri) => {
         } else {
           addresses = await dns.resolve4(input);
         }
-        const matcher = new CIDRMatcher([process.env.PRIVATE_VOIP_NETWORK_CIDR]);
+        const matcher = new CIDRMatcher(process.env.PRIVATE_VOIP_NETWORK_CIDR.split(','));
         for (const ip of addresses) {
           if (matcher.contains(ip)) {
             return true;