diff --git a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
index 7a162630..cee67752 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/Utils.kt
@@ -331,7 +331,7 @@ object Utils {
     }
 
     fun isTelNumber(no: String): Boolean {
-        return no.isNotEmpty() && Regex("^([+][1-9])?[0-9- ()]{0,20}\$").matches(no)
+        return no.isNotEmpty() && Regex("^([+][1-9])?[0-9- (),#]{0,24}\$").matches(no)
     }
 
     fun isTelUri(uri: String): Boolean {