[cisco-voip] Failover testing

Wes Sisk wsisk at cisco.com
Sat Apr 29 11:19:15 EDT 2006 

the CM stopped/started test is a big hint.  Sounds like your incoming  
circuit is timing out the call before the h323 gateway hunts to an  
available CM.

when the server is shut down you must wait for TCP session establish  
timeout
when server is up but CM is shut down you get immediate ICMP port  
unreachable from CM back to the GW so the GW knows to try the next  
available member (usually specified with 'preference' on the voip  
dial-peer)


You probably need to decrease the h225 session setup timers in your  
gateway confiug:
http://www.cisco.com/en/US/customer/products/sw/voicesw/ps556/ 
products_configuration_example09186a0080094852.shtml
You could even turn it down to 1:
h225 timeout tcp establish 1

if CM does not respond in 1 second (depending on your network round  
trip time) most likely it is not going to respond at all.

/Wes


On Apr 29, 2006, at 11:09 AM, Nick Kassel wrote:

We have been doing some failover testing between call managers today  
and I have come across an issue with one of out remote sites. We have  
a 3 call manager cluster and the if I shut down the subscriber that  
this site is registered to then all the phones will register to the  
other subscriber but when I place a call to the phones I get  
destination out of order on the debug, I have dial peers for all  
three call managers in the config, however if I were to just stop the  
call manager service on the subscriber and not shut the server down  
then I can place calls to the phones fine, it would appear that when  
the subscriber is not on the network then the calls don’t go through.  
Has anyone seen any issues like this before.


The config is as follows.

!

!

!

dial-peer cor custom

!

!

!

dial-peer voice 100 voip

  destination-pattern .

  codec g711ulaw

  fax rate disable

  no vad

!

dial-peer voice 9 pots

  call-block translation-profile incoming call_block_profile

  call-block disconnect-cause incoming invalid-number

  destination-pattern 9T

  progress_ind alert enable 8

  fax rate disable

  direct-inward-dial

  port 0/0:15

!

dial-peer voice 8201 voip

  description Fax Dial-Peer

  destination-pattern 8020[1-3]

  progress_ind setup enable 3

  session target ipv4:172.21.18.3

  dtmf-relay h245-alphanumeric

  codec g711ulaw

  fax rate disable

  ip qos dscp cs5 media

  no vad

!

dial-peer voice 82 voip

  destination-pattern 802..

  progress_ind setup enable 3

  translate-outgoing calling 1

  session target ipv4:172.30.0.2

  dtmf-relay h245-alphanumeric

  codec g711ulaw

  ip qos dscp cs5 media

  no vad

!

dial-peer voice 83 voip

  destination-pattern 802..

  progress_ind setup enable 3

  translate-outgoing calling 1

  session target ipv4:172.30.0.3

  dtmf-relay h245-alphanumeric

  codec g711ulaw

  ip qos dscp cs5 media

  no vad

!

dial-peer voice 84 voip

  destination-pattern 802..

  progress_ind setup enable 3

  translate-outgoing calling 1

  session target ipv4:172.20.100.2

  dtmf-relay h245-alphanumeric

  codec g711ulaw

  ip qos dscp cs5 media

  no vad

!

num-exp 02.. 802..

gateway

  timer receive-rtp 1200

!

!

call-manager-fallback

  secondary-dialtone 9

  max-conferences 4

  ip source-address 172.21.18.2 port 2000

  max-ephones 48

  max-dn 60

  time-format 24

  date-format dd-mm-yy

!

!

line con 0

line aux 0

line vty 0 4

  exec-timeout 60 0

  password telnet

  login

!

!

end





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