Hi Expert..

I just wondering, if I have the topology below.... So, if RouterC would like to call RouterA.. how RouterB forward RouterC call to RouterA?

Is there any features or options should I use?

And in this topology, eigrp is involve (I can ping the host on RouterA from RouterC but I cannot ring the ip phone on RouterA)

RouterA---------------RouterB---------------RouterC

     |                                |                                     |

     |                                |                                     |

Ip phone 2000       IP ph 2001                IP ph 2002

Thanks in advance