IPTABLES port forwarding to SIP UDP not working. Ask Question # iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT --to 192.168.1.2:8080 # iptables -A FORWARD -p tcp -d 192.168.1.2 --dport 8080 -j ACCEPT ###HTTP Forwarding Rule### iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j DNAT --to 10.0.4.1:80 iptables -A

Basic Vulnerability Issues for SIP Security UDP SDP User Agents IPv4 SIP Proxy IPv6 TCP RTCP RTP Codec SIP Security Overview SIP has the same IP and application-level vulnerabilities as other VoIP protocols. There are several factors, which make SIP potentially less secure: • Maturity – the SIP standard and supporting implementations are relatively new. SIP ALG 101: Easy Steps to Disable SIP ALG On Any Router Jun 16, 2018 Use SIP with Twilio Voice - Twilio Session Initiation Protocol (SIP) is a standardized communications protocol that has been widely adopted for managing multimedia communication sessions for voice and video calls. SIP may be used to establish connectivity between your communications infrastructures such as an on-premise or virtual PBX and Twilio's communications platform.

If I change the client and server config to use UDP (from transport=tcp to transport=udp,tcp or even simply transport=udp) the phone can no longer register and Asterisk sends SIP: SIP/2.0 401 Unauthorized to the client. From what I have read it is possible to use UDP behind a NAT with Asterisk, however experience seems to dictate otherwise.

System Configuration Guide for Cisco Unified Jun 17, 2020 SIP - The Wireshark Wiki

with SIP, when to use TCP not UDP? - Stack Overflow

SIP ALG 101: Easy Steps to Disable SIP ALG On Any Router Jun 16, 2018 Use SIP with Twilio Voice - Twilio Session Initiation Protocol (SIP) is a standardized communications protocol that has been widely adopted for managing multimedia communication sessions for voice and video calls. SIP may be used to establish connectivity between your communications infrastructures such as an on-premise or virtual PBX and Twilio's communications platform.