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Call Entry(Disconnect Cause=42)

Hey guys,


I'm wondering if someone can give a help on this issue.


I have a CISCO 2921 with a TDM interface E1 connecting using r2-digital to the PSTN provider.


I can receive calls successfuly but when i try to place calls i'm receving the following error:


Call Entry(Disconnect Cause=42, Voice Class Cause Code=0, Retry Count=0)


and the phones show me "High Traffic, Try again later"


My controller is configured like that:


controller E1 0/0/0

framing NO-CRC4

line-termination 75-ohm

ds0-group 1 timeslots 1-10 type r2-digital r2-compelled ani

cas-custom 1

  country brazil


  debounce-time 10



  category 2

  answer-signal group-b 1

  request-category 8


The Voice-port is configured like that:


voice-port 0/0/0:1

cptone BR



In annex there are the output from debug voice ccapi inout, debug vpm signal and the running config.


Thanks in advance for any help.




Call Entry(Disconnect Cause=42)


kindly check the below link for disconnect cause

Cause No. 42 - switching equipment congestion.
This cause indicates that the switching equipment generating this cause is experiencing a period of high traffic.

What it means:

Just too much going on at this point on the ISDN network to get the call through to its destination.

did you check the provider for this case ?



please don't forget to rate the helpful posts

Call Entry(Disconnect Cause=42)


The disconnect is being thrown because we are receive an R2_stop from the e1r2 circuit , it is shown above .You have to discuss that with your service provider . I recommend to use PRI instead.

Thank you

please rate if this will help

Call Entry(Disconnect Cause=42)


please find the below configuration , i have a customer has the same issue and the below configuration solved the issue

network-clock-participate wic 0
voice call send-alert
voice service voip
qsig decode
fax protocol pass-through g711alaw
  h225 timeout tcp call-idle value 2
  h225 timeout t302 1
  h225 timeout t304 1
  h225 timeout setup 1
  call start slow

controller E1 0/0/0
framing NO-CRC4
ds0-group 0 timeslots 1-10 type r2-digital r2-compelled ani

ds0-group 1 timeslots 11-15,17-31 type r2-digital r2-compelled ani

  cas-custom 0
  country brazil

ani-digits min 4 max 20
cas-custom 1
  countrybrazil use-defaults


interface GigabitEthernet0/0
description LAN Connection
ip address
duplex auto
speed auto
h323-gateway voip bind srcaddr

voice-port 0/0/0:0
cptone BR

voice-port 0/0/0:1
cptone BR
timeouts interdigit 2
timeouts call-disconnect 3
timeouts wait-release 2

dial-peer voice 1000 voip
destination-pattern 68..
session target ipv4:
dtmf-relay h245-alphanumeric
codec g711ulaw

dial-peer voice 1 pots
preference 1
destination-pattern .T
port 0/0/0:1

Thank you

please rate if this will help

VIP Super Bronze

Call Entry(Disconnect Cause=42)


I am not an expect on R2-CAS but looking at the ccapi logs I can tell that the call is disconnected from your ITSP

The disconnect is coming from the outbound call leg (109 and 110)

The questions is which side is diconnecting the call..The gateway or the Telco..When we look at the logs we can see that ots the Telco because in ccapi logs anything wit "_" is the call leg talking to cc_api_call_disconnected and anything without "_" eg ccapicalldisconnected is ccapi talking to the call leg.

So I suggest you open a case with your telco

Apr  8 23:06:49 UTC: r2_reg_channel_disconnected(0/0/0:1(1))

Apr  8 23:06:49 UTC: //110/002385FB0500/CCAPI/cc_api_call_disconnected:

   Cause Value=42, Interface=0x29E96298, Call Id=110

Apr  8 23:06:49 UTC: //110/002385FB0500/CCAPI/cc_api_call_disconnected:


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