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Session Initiation Protocol - Wikipedia
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Howto:What Ports are used for Signaling and Voice Traffic in SIP and H.323? - innovaphone-wiki
![Cisco Expressway IP Port Usage Configuration Guide (X14.0) - Mobile and Remote Access [Cisco Expressway Series] - Cisco](https://www.cisco.com/c/dam/en/us/td/i/400001-500000/440001-450000/446001-447000/446141.jpg "Cisco Expressway IP Port Usage Configuration Guide (X14.0) - Mobile and Remote Access [Cisco Expressway Series] - Cisco")
Cisco Expressway IP Port Usage Configuration Guide (X14.0) - Mobile and Remote Access [Cisco Expressway Series] - Cisco
Session Initiation Protocol - Wikipedia
