Can you help me about VoIP ? I need your help

From: hoang ha duc hai (hailinh57@gmail.com)
Date: Wed Oct 17 2007 - 01:30:39 ART

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Dear CCIE group

My name is Hai.
I have one problem when i configured VoIP. I have two routers, they are
connected together by FastEthernet interface . With Router A,i configured
two soft-phones which was installed on my desktops (i use Cisco's soft-phone
- CIPC) and one analog phone which was connected to router over Voice
module.With Router B i configured only one softphone (CIPC). First time, i
tried to call between two analog-phones or two CIPC and everything was ok .
Next time when i called between one analog phone (on Router B) and one
softphone (on Router A), i used the analog phone and my colleague used the
softphone, a problem happened - my colleague talked to me by the softphone
and i could hear everything he said , but i talked to him by the analog
phone - he could'nt hear anything i said. I'm wondering that where is my
mistake ? so i need your help. I'm waiting for your answer.

Thank you so much.

Your Faithfully

Hai

This is my diagram :

CIPC-A and B on desktop-----SWA-------analog phone A + Router A
-------FastEthernet0/0---------RouterB + analog phone B

AND this is my configuration

ROUTER A

version 12.4

service timestamps debug datetime msec

service timestamps log datetime msec

no service password-encryption

hostname RA

boot-start-marker

boot-end-marker

no aaa new-model

ip cef

multilink bundle-name authenticated

voice-card 0

no dspfarm