I am trying to configure integrated digital modem via ISDN-PRI link on a cisco 3660 router. Following is the basic configuration;
( using NM-30DM and NM-1CE1B modules);
hostname Router
!
!
modem country mica united-kingdom
ip subnet-zero
!
isdn switch-type primary-net5
modemcap entry mica
!
controller E1 4/0
pri-group timeslots 1-31
!
!
interface Loopback0
ip address 172.30.1.1 255.255.255.0
!
!
interface Serial4/0:15
ip unnumbered Loopback0
encapsulation ppp
isdn switch-type primary-qsig
isdn incoming-voice modem
isdn T310 40000
isdn negotiate-bchan
isdn bchan-number-order ascending
!
interface Group-Async1
ip unnumbered Loopback0
encapsulation ppp
dialer in-band
dialer pool-member 2
async mode dedicated
no peer default ip address
ppp authentication chap
group-range 161 190
!
line con 0
line 161 190
modem InOut
modem autoconfigure type mica
transport input all
line aux 0
line vty 0 4
login
!
ISDN seems to be OK as per the following 'sh isdn status';
Router#sh isdn status
Global ISDN Switchtype = primary-net5
ISDN Serial4/0:15 interface
dsl 0, interface ISDN Switchtype = primary-qsig
**** Slave side configuration ****
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x7FFF7FFF
Number of L2 Discards = 0, L2 Session ID = 1
Total Allocated ISDN CCBs = 0
But, when I try to make a dial using internal digital modems, I get the following error message;
01:39:26: ISDN Serial4/0:15: isdn_is_bchannel_available: No Free B-channels
I try to change the b-channel selection order ( ascending /descending) and other parameters, but still no improvement.
What could be the possible reasion ?
