Aastra OpenCom 130 User Guide - Page 133
Telephony: Devices: VoIP Phones, Gateway card, a port in the range 1024 - 1087 is used.
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Voice over IP (VoIP) VoIP System Telephones 4. The operations software sends a DHCP request on the broadcast address 255.255.255.255. The VoIP system telephone now receives an IP address, network mask and default gateway for operations from the DHCP server. Using "Option 43", which is reserved for this purpose, the DHCP server also provides the IP address of the communications system and port number 8100 for registration. 5. The VoIP system telephone creates a TCP connection to the supplied IPaddress/port-number combination and sends a registration query. The OpenCom 100 checks the MAC address sent with the registration and confirms the registration request if the VoIP system telephone is listed in the menu Telephony: Devices: VoIP Phones. The keep-alive time, port number (8101) for telephony signalling and the value to use for the TOS byte are also communicated in the registration answer. 6. The VoIP system telephone creates a second TCP connection using the signalling port number 8101 and sends a registration analogue to the Upn system telephones. 7. Extra connections are created using the IP protocol RTP ("Realtime Transport Protocol") for call data when a call is created. For calls between two VoIP system telephones, port numbers above 8200 are used. For transmission to a Media Gateway card, a port in the range 1024 - 1087 is used. If you wish to operate a VoIP system telephone via a routed IP connection (for example VPN or RAS) it may be necessary to configure an external DHCP server accordingly. Please note the selection of the codec and keep-alive time for RAS connections. This can be done by selecting the default profile RAS in the Telephony: Devices: VoIP Phones for the VoIP system telephone. The operations software provided via TFTP must match the type of device and communications system. You may also need to configure BOOTP, DHCP and TFTP servers for the VoIP system telephone. 131