ISDN callback history showing failures

[b-docherty]

I have a central Callback server with PRI (3620) which receives callback requests from a 2611 (with up to 5 BRIs) Each BRI has a seperate telephone number (can't change this).

The config is built on rotary dialer and dialer map commands.

The config appears to be functioning correctly and adding channels as load increases BUT the central router (callback server) shows multiple failures in the "show isdn history table".

It appears as if the call comes into the callback server and the callback occurs to the dial string on the first dialer map statement. As the traffic load increases more channels are added. BUT it appears that every time a channel has to be added the router has to fail the previous channels which are already in use (BUSY). By the time the router gets to the 5th BRI it has to fail each of the previous 4 in turn. This is not necessarily causing much delay but it makes monitoring the ISDN calls very awkward. The remot router does not show any failures.

Any ideas how to prevent the failures on ISDN HISTORY?

Call Calling Called Remote Seconds Seconds Seconds Charges

Type Number Number Name Used Left Idle Units/Currency

--------------------------------------------------------------------------------

In 104 ---N/A--- farend 1

Out ---N/A--- 101 farend 311 0

Out ---N/A--- 101 farend 280 0

Out ---N/A--- 101 Failed 0

Out ---N/A--- 102 farend 248 0

Out ---N/A--- 101 Failed 0

Out ---N/A--- 102 farend 216 0

Out ---N/A--- 101 Failed 0

Out ---N/A--- 102 Failed 0

Out ---N/A--- 103 farend 183 0

Out ---N/A--- 101 Failed

Out ---N/A--- 102 Failed

Out ---N/A--- 103 farend 151 0

Out ---N/A--- 101 Failed

Out ---N/A--- 102 Failed

Out ---N/A--- 103 Failed

Out ---N/A--- 104 farend 119 0

Out ---N/A--- 101 Failed

Out ---N/A--- 102 Failed

Out ---N/A--- 103 Failed

Out ---N/A--- 104 farend 87 0

Out ---N/A--- 101 Failed

Out ---N/A--- 102 Failed

Out ---N/A--- 103 Failed

Out ---N/A--- 104 Failed

Out ---N/A--- 101 Failed

Out ---N/A--- 102 Failed

Out ---N/A--- 103 Failed

Out ---N/A--- 104 Failed

-------------------------------------------------------------------------------

[makchitale]

Can you please post the relevant portions of the callback servers configs that has the dialer maps & the physical interface (if using dialer interface).

Thanks, Mak.

[b-docherty]

Extract of config of Callback server (hq) and Callback Client (farend)

_____________________

CALLBACK SERVER- hq

______________________

!

controller E1 1/0

pri-group timeslots 1-31

description ISDN PRI 1

!

!

interface Serial1/0:15

no ip address

encapsulation ppp

dialer rotary-group 10

dialer-group 1

isdn switch-type primary-net5

no peer default ip address

no cdp enable

ppp authentication chap

ppp multilink

!

interface Dialer10

ip unnumbered FastEthernet0/0

encapsulation ppp

dialer in-band

dialer callback-secure

dialer idle-timeout 10

dialer enable-timeout 1

dialer map ip 172.16.117.251 name mhome class dial1 100008

dialer map ip 172.16.124.251 name farend class dial2 101

dialer map ip 172.16.124.251 name farend class dial2 102

dialer map ip 172.16.124.251 name farend class dial2 1003

dialer map ip 172.16.124.251 name farend class dial2 104

dialer hold-queue 100 timeout 5

dialer load-threshold 1 either

dialer-group 1

no peer default ip address

no cdp enable

ppp callback accept

ppp authentication chap

ppp multilink

ppp timeout multilink link add 2

multilink max-links 7

!

ip classless

ip route 0.0.0.0 0.0.0.0 172.16.103.253

ip route 172.16.117.0 255.255.255.0 172.16.117.251

ip route 172.16.117.251 255.255.255.255 Dialer10

ip route 172.16.124.0 255.255.255.0 172.16.124.251

ip route 172.16.124.251 255.255.255.255 Dialer10

ip route 172.31.255.201 255.255.255.255 172.16.124.251

ip route 172.31.255.202 255.255.255.255 172.16.117.251

ip http server

!

!

map-class dialer dial1

dialer callback-server username

!

map-class dialer dial2

dialer callback-server username

access-list 101 permit ip any any

dialer-list 1 protocol ip list 101

_____________________

CALLBACK CLIENT- farend

______________________

!

!

interface BRI1/0

no ip address

encapsulation ppp

dialer rotary-group 1

isdn switch-type basic-net3

no cdp enable

ppp authentication chap

ppp multilink

!

interface BRI1/1

no ip address

encapsulation ppp

dialer rotary-group 1

isdn switch-type basic-net3

no cdp enable

ppp authentication chap

ppp multilink

!

interface BRI1/2

no ip address

encapsulation ppp

dialer rotary-group 1

isdn switch-type basic-net3

no cdp enable

ppp authentication chap

ppp multilink

!

interface BRI1/3

no ip address

encapsulation ppp

dialer rotary-group 1

isdn switch-type basic-net3

no cdp enable

ppp authentication chap

ppp multilink

!

interface BRI1/4

no ip address

encapsulation ppp

shutdown

dialer rotary-group 1

isdn switch-type basic-net3

no cdp enable

ppp authentication chap

ppp multilink

!

!

interface Dialer1

ip unnumbered Ethernet0/0

encapsulation ppp

dialer in-band

dialer idle-timeout 16

dialer map ip 172.16.103.251 name hq 200001

dialer hold-queue 100 timeout 5

dialer-group 1

no cdp enable

ppp callback request

ppp authentication chap

ppp multilink

multilink max-links 10

!

ip classless

ip route 0.0.0.0 0.0.0.0 172.16.103.251

ip route 172.16.103.251 255.255.255.255 Dialer1

ip http server

!

access-list 101 permit ip any any

dialer-list 1 protocol ip list 101

!

[b-docherty]

Apologies the dialer map statements have changed since I recorded the earlier "show isdn history output" The failure behaviour is still the same:

These are the relevant statements for the earlier history output.

dialer map ip 172.16.124.251 name farend class dial2 101

dialer map ip 172.16.124.251 name farend class dial2 102

dialer map ip 172.16.124.251 name farend class dial2 103

dialer map ip 172.16.124.251 name farend class dial2 104