Yealink Skype for Business HD IP Phones Administrator Guide360Protocols and Ports IssuesWhat communication protocols and ports do Yealink Skype for Business phones support?SourceDevice Source IP SourcePortDestinationDevice Destination IP Destination Port(Listening port) Protocol Description of destination portSkype forBusinessphonesIP addressof SkypeforBusinessphones2~65535Skype for Businessphone or voicegatewayIP address ofSkype for Businessphone or voicegatewayDetermined bydestination device. UDP RTP protocol port, it is used tosend or receive audio stream.1024~65535 SIP Server IP address of SIPserverDetermined bydestination device. UDP/TCPSIP protocol port, it is used forsignaling interaction with SIPserver.1024~65535 File server IP address of fileserverDetermined bydestination device. TCP HTTP protocol port, it is used todownload file.1024~65535 AA IP address of AA Determined bydestination device. TCP HTTP protocol port, it is used forAA communication.68 DHCP Server IP address ofDHCP server 67 UDPDHCP protocol port, it is used toobtain IP address from DHCPserver.1024~65535 NTP Server IP address of NTPserver 123 UDPNTP protocol port, it is used tosynchronize time from NTP timeserver.1024~65535 Syslog Server IP address ofsyslog server 514 UDP Syslog protocol port, it is usedfor Skype for Business phones
