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SIP: Firewall Rules – Symonics GmbH
https://symonics.com/sip-firewall/#:~:text=If%20you%20want%20to%20use%20an%20audio%20codec,must%20be%20opened%20for%20outgoing%2C%20bidirectional%20data%20flows.
Sip Trunking and Firewall Settings
https://www.siptrunk.com/2019/07/sip-trunking-and-firewall-settings/
Digitcom SIP Trunks. Forward outside traffic from port-5060 (UDP/TCP) to the IP office IP address. Port forwards to your firewall must be Digitcom’s IP Subnets 199.175.43.0/24 and 45.42.27.0/24. This prevents unauthorized access from outside internet IP addresses. For audio, open RTP ports with the default IP Office ports at 46,750-50,750.
Understanding SIP Firewall Configuration - DrVoIP
https://drvoip.com/support/knowledgebase.php?article=3
Incoming Ports In a default installation of a VOIP Phone System, the PBX listens for SIP messages on ports 5060 (UDP & TCP). The audio streams are handled by ports UDP RTP ports that you must configure as a range. For example, 9000-9049 (UDP only) – this will allow up to 25 simultaneous calls with VoIP providers or with remote extensions.
SIP: Firewall Rules – Symonics GmbH
https://symonics.com/sip-firewall/
SIP: Firewall Rules. If you want to use an audio codec in your local network, then you have to configure the firewall of your LAN. Please ask for network adminstrator to set up the following firewall rules: Outgoing SIP signaling. Port 5060/UDP, port 5062/UDP, and port 5060/TCP must be opened for outgoing, bidirectional data flows.
SIP with NAT or Firewalls - Asterisk Guru
http://asteriskguru.com/tutorials/sip_nat_oneway_or_no_audio_asterisk.html
On your router NAT/firewall, forward SIP ports 5060 - 5082 and RTP ports 8000 - 20000 to your * server IP address. Then edit the "rtpstart" value in rtp.conf - from rtpstart=10000 to rtpstart=8000 since 8000 is the default RTP port on x-lite phones.
Firewall Support for SIP - Cisco
https://www.cisco.com/c/en/us/td/docs/ios/sec_data_plane/configuration/guide/12_4/sec_data_plane_12_4_book/sec_fwall_sip_supp.pdf
† Feature Information for Firewall SIP Support, page 13. Firewall Support for SIP ... SIP (Session Initiation Protocol) SIP is an ASCII-based, application-layer control protocol that can be used to establish, maintain, and ... “m=audio 20758 RTP/AVP 0” ...
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