One-way telephone call from FXO to FXS

[npinto]

Hi guys, I´m sorry if this is not the right group to post this thread.

I have two 2811 running:
Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9_IVS-M), Version 12.4(2)T6, RELEASE SOFTWARE (fc3)

One router (RT_FXS) has 2 FXS ports, the other router(RT_FXO) has 2 FSX and 2 FX0 port.
The idea is to have 1 analog phones in each router, and the routers are connected using a FXO-to-FXS rj11 cross cable.
So one router (RT_fxs emulates a CO SWITCH)
The only thing that I could make work is to make calls from phone in router RT_FXO to phone in router RT_FXS

When I try to make a call from phone in router RT_FXS ( simulate a call from a CO SWITCH), the phone on the other router ring one time, then goes off-hook and 1 second latter goes on-hook, this happens without touching the phone.

Router RT_fxs has the following configuration:

voice-port 0/2/0
description FXS port connected to FXO on other router
!
voice-port 0/2/1
description FXS port connected to phone
!
dial-peer voice 2000 pots
preference 1
destination-pattern 2000
port 0/2/1
!
dial-peer voice 3000 pots
destination-pattern 3...
port 0/2/0


Router RT_fxo has the following configuration:
voice-port 0/2/1
description FXS port connected to phone
!
voice-port 0/3/0
connection plar 3000
description FXO port connected to other router
!
dial-peer voice 3000 pots
preference 1
destination-pattern 3000
port 0/2/1
!
dial-peer voice 2000 pots
destination-pattern 2...
no digit-strip
port 0/3/0