SpectraLink NetLink Wireless Telephones Best Practices White Paper Wireless Telephone - Manual (Page 16)

White Paper
Page 15
the IP telephony protocol used on the telephony switch interface. The
telephony switch vendor should be able to supply the port numbers used
by the protocol.
The NetLink Wireless Telephones, NetLink Telephony Gateways, and
NetLink SVP Server use TCP and UDP and other common IP protocols
from time to time. These include DHCP, DNS, WINS, TFTP, FTP,
Telnet, ARP, and ICMP. SpectraLink uses proprietary UDP channels
between the infrastructure components that use UDP ports 5454 - 5458.
The push-to-talk (PTT) mode of the NetLink i640 Wireless Telephone
uses the multicast IP address 224.0.1.116, which is also used by the
NetLink Wireless Telephones and infrastructure components to locate
and maintain each other.