- Use strong credentials and TLS for signalling.
- Rate-limit registrations to stop extension scanning and toll fraud.
- Alert on unexpected chat protocols leaving servers (possible command and control).
Voice & chat ports
VoIP signalling, WebRTC, XMPP, IRC and other real-time chat. 58 ports, most common first.
| Port | Service | Transport | Risk | Encryption |
|---|---|---|---|---|
| 5060 | SIP sip | UDP TCP SCTP | 6/10 high | no |
| 5061 | SIP over TLS sips | TCP UDP SCTP | 4/10 moderate | yes |
| 3478 | STUN / TURN stun, stun-behavior, turn | UDP TCP | 3/10 moderate | no |
| 5222 | XMPP client xmpp-client | TCP | 3/10 moderate | optional |
| 6667 | IRC | TCP | 6/10 high | no |
| 194 | Internet Relay Chat Protocol irc | TCP UDP | - | - |
| 529 | IRC-SERV irc-serv | TCP UDP | - | - |
| 531 | chat conference | TCP UDP | - | - |
| 767 | phone phonebook | TCP UDP | - | - |
| 1071 | BSQUARE-VOIP bsquare-voip | TCP UDP | - | - |
| 1119 | Battle.net Chat/Game Protocol bnetgame | TCP UDP | - | - |
| 1152 | Winpopup LAN Messenger winpoplanmess | TCP UDP | - | - |
| 1259 | Open Network Library Voice opennl-voice | TCP UDP | - | - |
| 1300 | H.323 Secure Call Control Signalling h323hostcallsc | TCP UDP | - | - |
| 1336 | Instant Service Chat ischat | TCP UDP | - | - |
| 1718 | H.323 Multicast Gatekeeper Discover h323gatedisc | TCP UDP | - | - |
| 1719 | H.323 Unicast Gatekeeper Signaling h323gatestat | TCP UDP | - | - |
| 1720 | H.323 Call Control Signalling h323hostcall | TCP UDP SCTP | - | - |
| 1990 | cisco STUN Priority 1 port stun-p1 | TCP UDP | - | - |
| 1991 | cisco STUN Priority 2 port stun-p2 | TCP UDP | - | - |
| 2000 | Cisco SCCP cisco-sccp | TCP UDP | - | - |
| 2031 | mobrien-chat mobrien-chat | TCP UDP | - | - |
| 2415 | Codima Remote Transaction Protocol codima-rtp | TCP UDP | - | - |
| 2427 | Media Gateway Control Protocol Gateway mgcp-gateway | TCP UDP | - | - |
| 2517 | H.323 Annex E Call Control Signalling Transport call-sig-trans | TCP UDP | - | - |
| 2703 | SMS CHAT sms-chat | TCP UDP | - | - |
| 2727 | Media Gateway Control Protocol Call Agent mgcp-callagent | TCP UDP | - | - |
| 2860 | Dialpad Voice 1 dialpad-voice1 | TCP UDP | - | - |
| 2861 | Dialpad Voice 2 dialpad-voice2 | TCP UDP | - | - |
| 3032 | Redwood Chat redwood-chat | TCP UDP | - | - |
| 3219 | WMS Messenger wms-messenger | TCP UDP | - | - |
| 3447 | DirectNet IM System directnet | TCP UDP | - | - |
| 3449 | HotU Chat hotu-chat | TCP UDP | - | - |
| 3654 | VAP RealTime Messenger vaprtm | TCP UDP | - | - |
| 3771 | RTP Paging Port paging-port | TCP UDP | - | - |
| 4455 | PR Chat User prchat-user | TCP UDP | - | - |
| 4456 | PR Chat Server prchat-server | TCP UDP | - | - |
| 4605 | Direct End to End Secure Chat Protocol sixchat | TCP | - | - |
| 4621 | Bidirectional single port remote radio VOIP and Control stream ventoso | UDP | - | - |
| 4801 | Icona Web Embedded Chat iwec | TCP UDP | - | - |
| 5004 | RTP media data avt-profile-1 | TCP UDP DCCP | - | - |
| 5005 | RTP control protocol avt-profile-2 | TCP UDP DCCP | - | - |
| 5269 | XMPP Server Connection xmpp-server | TCP | - | - |
| 5280 | Bidirectional-streams Over Synchronous HTTP (BOSH) xmpp-bosh | TCP | - | - |
| 5298 | XMPP Link-Local Messaging presence | TCP UDP | - | - |
| 5349 | STUN Behavior Discovery over TLS stun-behaviors, stuns, turns | TCP UDP | - | yes |
| 6697 | Internet Relay Chat via TLS/SSL ircs-u | TCP | - | yes |
| 6817 | PenTBox Secure IM Protocol pentbox-sim | TCP | - | - |
| 8192 | SpyTech Phone Service spytechphone | TCP UDP | - | - |
| 8417 | eSpeech RTP Protocol espeech-rtp | TCP UDP | - | - |
| 8711 | Nuance Voice Control nvc | TCP | - | - |
| 9011 | D-Star Routing digital voice+data for amateur radio d-star | UDP | - | - |
| 9750 | Board M.I.T. Synchronous Collaboration board-voip | TCP UDP | - | - |
| 10116 | NetIQ VoIP Assessor netiq-voipa | TCP UDP | - | - |
| 11720 | H.323 Call Control Signalling Alternate h323callsigalt | TCP UDP | - | - |
| 12345 | Italk Chat System italk | TCP UDP | - | - |
| 22555 | Vocaltec Internet Phone vocaltec-phone, vocaltec-wconf | UDP TCP | - | - |
| 35354 | KIT Messenger kitim | TCP | - | - |
Securing voice & chat services
Other port categories
Web /tools/ports/category/web Remote access /tools/ports/category/remote-access File transfer & sharing /tools/ports/category/file-transfer Email /tools/ports/category/email Databases & caches /tools/ports/category/databases Directory & authentication /tools/ports/category/directory-auth Network services /tools/ports/category/network-services VPN, tunnels & proxies /tools/ports/category/vpn-tunnels Messaging & queues /tools/ports/category/messaging Media & streaming /tools/ports/category/media IoT & industrial (ICS) /tools/ports/category/iot-ics DevOps, cloud & containers /tools/ports/category/devops Monitoring & logging /tools/ports/category/monitoring Gaming /tools/ports/category/gaming Other services /tools/ports/category/other