Appendix I: DAP multicast group
membership
The SIP DECT product is a combination of advanced technologies in both wireless communications and
networking. Wireless communications are implemented by means of DECT technology; while on the
networking side, various IPv4 and other network technologies are used as a supporting infrastructure for
VoIP communications.
This appendix focuses on a specific network technology that is core to the SIP DECT product — IPv4
multicast and its network configuration management.
For more information, refer to the following RFCs:
• RFC1122 Requirements for Internet Hosts - Communication Layers
• RFC4291 IP Version 6 Addressing Architecture
• RFC 2236 Internet Group Management Protocol, Version 2
• RFC4541 Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener
Discovery (MLD) Snooping Switches
DECT Access Point network interface
The DECT Access Point (DAP) network interface is an industry-standard Ethernet interface
which can be wired to a 10/100Mbps UTP switch port, optionally with Power over Ethernet
(POE). These are the most common installations.
One or more network switches are combined to provide the backbone through which the SIP
DECT VoIP solution is provided. In many cases, the DAPs are put on a specific VLAN (by
means of switch port configuration) in order to provide certain guarantees for Quality of Service
(QoS) and separation of network traffic.
These techniques are primarily focused on IPv4 unicast and broadcast. The SIP DECT product
also utilizes IPv4 multicast, which is handled separately from the other traffic. The multicast
network topology does not match the (V)LAN and is maintained dynamically.
These characteristics of IPv4 multicast mean that additional planning and configuration must
take place both in the configuration of the IPv4 multicast nodes (the DAPs) and in the involved
network infrastructure.
SIP DECT Fundamentals
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