BRI dialing Channel 1 to Channel 1

I have a cisco 802 and I need to get set up so that only Channel 1 (Spid 1) dials channel 1 (spid 1) on the main router and still do multi link. What I am trying to accomplish is a toll saver. We have a saver plan that allows 1 number to be called long distance and not be charged by the minute but rather using a flat rate. So as long as Spid 1 calls Spid 1 and Spid 2 calls Spid 2 I have on per minutre ld charges. The problem I'm having is that at times (during the multilink?) Channel 2 (Spid 2) will dial Channel 1 (Spid 1) on the main router and the billing per minute starts.

How can I avoid this and still have multilink?



no service pad
service timestamps debug datetime localtime show-timezone
service timestamps log datetime localtime show-timezone
service password-encryption
!
hostname REMOTE
!
enable password xxxxx
!
username MAIN password xxxxx
!
clock timezone CST -6
clock summer-time DST recurring
!
ip subnet-zero
!
ip dhcp excluded-address 192.168.70.1 192.168.70.9
!
ip dhcp pool 1
   network 192.168.70.0 255.255.255.0
   default-router 192.168.70.1
   dns-server 192.168.1.6 192.168.1.4
   netbios-name-server 192.168.1.6 192.168.1.4
   netbios-node-type h-node
!
no ip domain-lookup
isdn switch-type basic-ni
!
!
!
interface Ethernet0
 description connected to EthernetLAN_1
 ip address 192.168.70.1 255.255.255.0
!
interface BRI0
 description connected to MAIN
 no ip address
 dialer rotary-group 1
 isdn switch-type basic-ni
 isdn spid1 111111 111111
 isdn spid2 222222 222222
 no cdp enable
!
interface Dialer1
 description connected to MAIN
 ip unnumbered Ethernet 0
 encapsulation ppp
 no ip split-horizon
 dialer in-band
 dialer idle-timeout 2147483
 dialer map ip 192.168.1.1 name MAIN broadcast 18063511056
 dialer hold-queue 10
 dialer load-threshold 1 either
 dialer-group 1
 no cdp enable
 ppp authentication chap
 ppp multilink
!
ip classless
ip route 192.168.1.1 255.255.255.255 Dialer 1
ip route 0.0.0.0 0.0.0.0 192.168.1.1
no ip http server
!
!
dialer-list 1 protocol ip permit
snmp-server community public RO
!
line con 0
 exec-timeout 0 0
 password xxxxxx
 login
 stopbits 1
line vty 0 4
 password xxxxxx
 login
!
!
sntp server 192.168.1.4
sntp server 192.168.1.6
end