Remote IP phones: Paging, Lamps, Conference, Date/Time issues

Symptoms: Remote IP phone - resolving various issues

• Resolving issues with paging
• Resolving issues with lamps
• Resolving issues with Date/Time
• Resolving issues with conference
• Cannot be conferenced on remote IP phone
• Date and Time is wrong on remote IP phone
• BLF does not illuminate on remote IP phone
• Mapped Line does not illuminate on remote IP phone
• Cannot receive pages from a remote IP phone

Facts: NBX 100

• NBX Phones
• NBX 1102 Business Phone 10 Mb
• NBX 2102 Business Phone 10/100 (Non - IR)
• NBX Basic Phone
• NBX 2102-IR Business Phone 10/100
• NBX PcXset
• NBX Chassis
• IP On-The-Fly
• IP Serve
• BLF
• Mapped Lines
• Lamp
• Led
• Paging
• Conference
• Internet Group Management Protocol (IGMP)
• Open Shortest Path First (OSPF)
• Distance Vector Multicast Routing Protocol (DVMRP)

Causes: Most vendor switches have IGMP enabled by default which means that any Multicast traffic will not be forwarded unless there is a request for that particular Multicast address. WAN routers not properly configured for IGMP and Multicast Routing Protocol

Fixes:

• Remember the following guidelines when configuring remote IP NBX telephones:

- IGMP protocol must be enabled throughout the entire connection and over WAN links, routers, and switches for proper operation of:

• Date and Time updates on the display
• Paging to work (remote IP phones can be paged and page other remote sites)
• Conference calls
• Mapped Line LED lamps
• BLF/DSS button lamps

- NBX Telephones do not make client join requests for multicasts

- The routers/switches must be set to do Multicast Routing such as DVMRP, PIM Dense Mode (Cisco), or MOSPF.

The routers must initiate an IGMP Query, which NBX devices will respond to, and the router will flood all ports for which it receives a reply with the multicast traffic the NBX sends for Conferencing, Paging, BLF lights, and phone display date and time updates.

NBX phones will reply to Queries, but will NOT initiate join requests. Therefore, it is up to the switch or router settings to propagate the multicast or initiate a query to the remote IP phones. See your router or switch manual for particular setup, but IGMP ver. 2 must be supported on all devices from NCP to each remote IP phone used for the above named features to function, along with Multicast Routing Protocol to query the remote NBX telephones.

• Product(s): NBX
• Sub Product(s): NBX 100, NBX Phones

— David Gonzalez 2021/04/10 14:10