![]() You said the phones have incoming calls problem, please tell me detail issue scenario and help us to get the trace files.Īnd please tell me how many phones in your side and 3CX version. port control the ports that the SIP ALG listens on for SIP sessions. The Polycom and Cisco also follow the same mechanism. sip tcp port 5060 no ip nat service sip udp port 5060. That's not following the SIP standard will bring many trouble for customer.Īnd also the main SIP phones vendors are all using the new mechanism, we are all following the Standard. ![]() If we are using old mechanism, each account have to use different ports. Ports are a transport layer (layer 4) concept. As for SIP standard, the default port should be 5060 for all accounts. Actually, the old mechanism is not a standard one. The vulnerability is due to improper processing of transient SIP packets on which NAT is performed. Additionally, if Internet Protocol security (IPsec) is deployed in your organization, IPsec must be disabled over the range of ports used for the. A vulnerability in the Network Address Translation (NAT) Session Initiation Protocol (SIP) Application Layer Gateway (ALG) of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. Skype for Business Server requires that specific ports on the external and internal firewalls are open. (Old mechanism: SIP local port for each account New mechanism: SIP local port for all accounts )īefore when we are using old mechanism, we really occurred may issues from many cusotmers. Summary: Review the port usage considerations before implementing Skype for Business Server. I want to explain again why we optimized it in V80 and higher version. I think some of your phones run V73 or lower firmware version, so it support different accounts with different ports. You can change the port via web interface->setting->SIP->local SIP port. In Yealink V80 and higher version, all accounts use one port to register. Signalling includes registration of the phone extension to its PBX server, status updates, BLF (Busy Lamp Field) data, and others. ![]()
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