VIDEO: SIP call setup overview & ports used Posted on November 14th, 2008 by Nick Galea, CEO, 3CX High level overview of SIP Call setup and the ports involved. By Nick Galea|November 14th, 2008|Comments Off on VIDEO: SIP call setup overview & ports used Related Posts Top Tips for Video Conference Server Optimizations May 9th, 2022 3CX Global IP Blacklist: Security By Default February 24th, 2022 Don’t Get Caught Out, Make a Disaster Recovery Plan! November 23rd, 2021 Import Active Directory Users via Azure AD & Enable SSO March 3rd, 2021 Update 7 Now Supporting Amazon Chime Voice Connector December 11th, 2020 Use 3CX’s Time-based Call Forwarding for Multiple Call Routing Rules December 10th, 2020 Call Fraud: Is Your VoIP System Protected? November 27th, 2020 Hackers Exploit VoIP Vulnerability Affecting Nearly 1,200 Organizations November 6th, 2020