100WLAN IP Telephony Manager 2245 configuration
Each WLAN IP Telephony Manager 2245 is configured with an IP address with which all of the wireless handsets communicate. In addition, each WLAN IP Telephony Manager 2245 is configured with a pool of IP addresses. When a wireless handset registers with a WLAN IP Telephony Manager 2245, the wireless handset is assigned one of the IP addresses from the pool. All communication between this WLAN IP Telephony Manager 2245 and other devices (TPS, IP Phones, gateways, and other wireless handsets) is always done through its pool IP address. In this sense, the WLAN IP Telephony Manager 2245 acts as a NAT (Network Address Translation)
Note: The WLAN IP Telephony Manager 2245 has a single physical Ethernet interface and MAC address; therefore, all of the IP addresses are mapped to a single MAC address.
•The WLAN IP Telephony Manager 2245 server tags and untags packets with the SVP header. SVP packets have the protocol byte of the IP header configured to 0x77.
Because the packets that traverse the network between the wireless handset and the WLAN IP Telephony Manager 2245 are not standard IP packets (the packets use a nonstandard protocol number), there can be no Layer 3 routing in the path. Therefore, the wireless handsets and WLAN IP Telephony Managers 2245 must be in the same logical subnet.
•RTP packets between the wireless telephone and the WLAN IP Telephony Manager 2245 always contain 30 ms worth of voice, no matter what is configured on the Call Server. The WLAN IP Telephony Manager 2245 repackages the RTP packets to conform to the size that is configured in the Call Server. This provides more efficient use of the available Radio Frequency (RF) bandwidth at the expense of slightly increased jitter and latency.
•The WLAN IP Telephony Manager 2245 is configured with a maximum allowable number of simultaneous media streams on a single AP. The WLAN IP Telephony Manager 2245 keeps track of the number of media streams on each AP and blocks calls to and from a wireless handset that would exceed the configured capacity. For more information about call blocking, see "Call blocking" (page 79).
•The WLAN IP Telephony Manager 2245 has limitations for high availability. There are some types of failure that can result in complete outages. Every group of WLAN IP Telephony Manager 2245s in a single subnet has a master node. If this node fails or if connectivity to it is lost,
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
Release 5.0 15 June 2007
