problem with VoIP bandwidth reservation

[foliveri]

I have the following scenario:

                                            ROUTER_B

                                        |

2 FXO>ROUTER_A ------ F. R. CLOUD -----ROUTER_C<2 FXO ports

<p>

The WAN provider gives me 2 PVC's: ROUTER_B <-> ROUTER_A

and ROUTER_B<->ROUTER_C

So ROUTER_A is at two hops from ROUTER_C. <br>

Voice calls between A and C works fine as long as the data traffic

doesn't reach a certain level, in wich voice quality quickly degrades.<br>

Previously I've used RSVP to acomplish QoS but always the routers

where directly connected or at least in the same F.R. PVC, etc.

The same configuration here doesn't work.<br>

My doubt is: is possible for this to work at all? If so, wich QoS

method should I use?

Any sample configuration?

Thanks in advance for any hint or suggestion

Regards,

[fbahram]

For RSVP to work, which is still not the preferred method, you must configure it on every single router in the path of the voip call.

The best way to configure traffic shaping, prioritization and fragmentation for your 3 routers, to process voip calls and give it priority over all data and also avoid delay by fragmenting your large data packets , is to use frame-relay traffic shaping and ip rtp priority OR LLQ. Either IP RTP PRIORITY or LLQ will do the prioritization for you....

A sample config is shown below:

http://www.cisco.com/warp/public/788/voip/voip_fr_frts_frf12.htm

http://www.cisco.com/warp/public/788/voice-qos/voip-ov-fr-qos.html

Hope this helps.