Isdn Layer 1 deactivated when there is no active call

Hi All,
I am in Nairobi Kenya. Here we use ISDN Basic-net3 and my problem is that most of the telco switches here deactivate Layer 1 when there is no active call.
When I try to initiate a call by using the ISDN test call command I get an error to the effect that B channel is not available.
The only way I can initiate a call is I first call the line then and then disconnect. Then I have about 5 seconds to make a test call and pings are successful. How do I make the router initiate a call when layer 1 is deactivated.
the debug isdn q921 out has nothing till a call comes in.
I also understatnd that European ISDN switches deactivate Layer 1 when there no active call. I dont have a problem with one of the switches, coz it does not bring down the line when there is no active call.
Thakx in advance
Martin

Thanks for the quick response.
It is a cisco 1760
The IOS is c1700-sv3y-mz.122-15.T5.bin
When I try to make a test call the show isdn status initially indicates that the router is trying to activate layer 1 then after 5 seconds it indicates that it is deactivated.
I have not yet configured DDR as indicated in the config file
Building configuration...
Current configuration : 3054 bytes
! Last configuration change at 00:38:54 UTC Mon Aug 9 1993
! NVRAM config last updated at 00:36:54 UTC Mon Aug 9 1993
version 12.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
hostname Gill-House
logging queue-limit 100
enable secret xxx
ip subnet-zero
no ip domain lookup
isdn switch-type basic-net3
no voice hpi capture buffer
no voice hpi capture destination
class-map match-all voice-traffic
match ip rtp 16384 16383
policy-map voice
class voice-traffic
priority 24
class class-default
fair-queue
gw-accounting syslog
interface Loopback0
description Loopback interface for VoIP Dial-peers
ip address 128.1.x.x.255.255.255
interface Multilink1
bandwidth 6
ip address 128.1.x.x.255.255.252
ip tcp header-compression iphc-format
ppp multilink
ppp multilink fragment-delay 20
ppp multilink interleave
multilink-group 1
ip rtp header-compression iphc-format
interface FastEthernet0/0
description Gill-House LAN
ip address 128.1.x.x.255.255.0
speed auto
interface Serial0/0
description Link to Head Office
bandwidth 64
no ip address
encapsulation ppp
no fair-queue
ppp multilink
multilink-group 1
interface BRI1/0
ip address 10.10.1.2 255.255.255.0
encapsulation ppp
isdn switch-type basic-net3
isdn point-to-point-setup
keepalive 20
router eigrp 100
passive-interface FastEthernet0/0
passive-interface Loopback0
network 128.1.0.0
no auto-summary
no eigrp log-neighbor-changes
ip classless
no ip http server
logging source-interface Loopback0
logging 128.1.1.179
call rsvp-sync
voice-port 2/0
cptone GB
ring frequency 50
voice-port 2/1
cptone GB
ring frequency 50
dial-peer cor custom
dial-peer voice 2 pots
destination-pattern 101
port 2/0
dial-peer voice 51 voip
destination-pattern 100
session target ipv4:128.1.0.254
ip qos dscp cs5 signaling
dial-peer voice 55 voip
destination-pattern 120
session target ipv4:128.1.31.254
ip qos dscp cs5 signaling
dial-peer voice 52 voip
destination-pattern 102
session target ipv4:128.1.91.254
ip qos dscp cs5 signaling
dial-peer voice 53 voip
destination-pattern 103
session target ipv4:128.1.121.254
ip qos dscp cs5 signaling
dial-peer voice 54 voip
destination-pattern 110
session target ipv4:128.1.21.254
ip qos dscp cs5 signaling
dial-peer voice 56 voip
destination-pattern 130
session target ipv4:128.1.41.254
ip qos dscp cs5 signaling
dial-peer voice 57 voip
destination-pattern 140
session target ipv4:128.1.111.254
ip qos dscp cs5 signaling
dial-peer voice 58 voip
destination-pattern 150
session target ipv4:128.1.61.254
ip qos dscp cs5 signaling
dial-peer voice 59 voip
destination-pattern 160
session target ipv4:128.1.71.254
ip qos dscp cs5 signaling
line con 0
logging synchronous
line aux 0
line vty 0 4
password housing
login
ntp clock-period 17208074
ntp server 128.1.1.211
ntp server 128.1.0.254
end
Gill-House#

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