Here is as a reminder a collection of TCP/ UDP Ports used in an IP Telephony network:
| PORT | PURPOSE |
| TCP/1433 | SQL |
| TCP/2552 | Call Manager database change notifications |
| TCP/2555 | RIS database server |
| TCP/2556 | RIS database client |
| UDP/3000 | Receive change notification from Call Manager database |
| UDP/3001 | Database change notification from publisher to applications |
| UDP/3020 | Dialed Number Analyzer plug-in database |
| TCP/3372 | SQL Distributed Transaction Coordinator |
| TCP/7727 | Application database change notification, CTI, voicemail, and so on |
| TCP/8001 | Client database change notification |
| TCP/8002 | Intracluster Communication Service |
| TCP/8003 | Intracluster Communication Service |
| TCP/8009 | Internal Tomcat requests |
| TCP/8111 | IPMA Web requests |
| TCP/8222 | Extension Mobility web requests |
| TCP/8333 | Webdialer web requests |
| TCP/8444 | Extension Mobility service requests |
| TCP/8555 | Apache-SOAP web requests |
| TCP/8666 | IPMA web requests for nondefault locales |
| TCP/8777 | Tomcat manager web requests |
| TCP/9007 | CDR Aalysis and Recording web requests |
| TCP/102 | Directory Access Protocol (DAP) for DC Directory |
| TCP/8404 | Local Directory Access Protocol (LDAP) for DC Directory |
| TCP/8405 | LDAPS for DC Directory |
| TCP/389 | LDAP query to external directory (AD, Netscape) |
| TCP/636 | LDAPS query to external directory (AD, Netscape) |
| TCP/2000 | SCCP |
| TCP/2443 | Secure SCCP (SCCPS) |
| TCP/3804 | CAPF |
| UDP/16384 – 32768 | RTP,SRTP |
| TCP/4224 | Cisco VT Advantage |
| UDP/1718 | Gatekeeper H225 Discovery |
| UDP/1719 | Gatekeeper H225 RAS |
| TCP/1720 | H225 signaling services for H323 gateways and Inter-Cluster Trunk (ICT) |
| UDP/2427 | MGCP gateway control |
| TCP/2428 | MGCP gateway backhaul |
| TCP/UDP/5060 | SIP Gateway and Inter-Cluster Trunk |
| TCP/2444 | CTL Provider |
| TCP/2748 | CTI Application Server |
| TCP/2789 | JTAPI Application Server |
| TCP/2912 | IPMA Server |
| TCP/1099-1129 | Attendant Console |
| UDP/3223 | Attendant Console |
| UDP/4321 | Attendant Console |
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