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Random outbound PSTN calls are disconnected Gateway, Cisco CM, Mediation RRS feed

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    Hello fellow OCSers,

    I have a situation that I am currently trying to troubleshoot.

    Current environment.

    Cisco Gateway and Cisco Call Manager 5.1 on the same switch and is separated from the OCS environment by a Juniper firewall

    Mediation server and OCS pool on the same VLAN on the other side of the the firewall. 

     

    At times calls that were previously successful are not able to connect. For example, at 9:00 I dial 555-555-5555 and the call connects.  At 9:05 I dial 555-555-5555 and the call fails.  I was able to capture an example using the OCS VoIP test set.  Users are also experiencing up to 8 seconds before the ring back starts when dialing a PSTN number. I am not sure if these two items are related (see below).  Maybe the long delay is causing a timeout? 

     

    We also have a quick and dirty lab environment with everything on one box with no firewall between the Mediation server and the gateway.  In that environment, there are no delays when calling a PSTN number. So I believe the delay probably is being caused by firewalls in the environment. 

     

    Has anyone seen this behavior before? Any help will be appreciated. 

    Thank you in advance -  Jo

     

    Non - working call

    VoIP Test Set: Idle->SigningIn

    Registration State: Unregistered->Registering

    Registration State: Registering->Unregistered

    VoIP Test Set: SigningIn->Idle

    VoIP Test Set: Idle->SigningIn

    Registration State: Unregistered->Registering

    Registration State: Registering->Unregistered

    VoIP Test Set: SigningIn->ProvidingCredentials

    Registration State: Unregistered->Registering

    Registration State: Registering->Registered

    VoIP Test Set: ProvidingCredentials->Ready

    -----

    Session State: Idle->Connecting

    Provisional Response: 100 Trying

    Provisional Response: 101 Progress Report

    Diagnostics: Error ID=12006

       Reason=Trying next hop

       Source=FrontendOCS

       appname=OutboundRouting

       phoneroute=Route

       phoneusage=CN={**********************},CN=Phone Route Usages,CN=RTC Service,CN=Microsoft,CN=System,DC=tsvc,DC=lab,DC=com

       gateway=MediationServer:5061

    Exception Message: The requested operation failed.

    Session State: Connecting->Idle

    Response Code: 503 Service Unavailable

    Diagnostics: Error ID=10000

       Reason=Gateway returned a SIP failure code

       Source=Mediation

       sipresponsecode=503

       sipresponsetext=Service Unavailable

       gatewayfqdn=10.10.10.10

       component=MediationServer

    Working Call

    Session State: Idle->Connecting

    Provisional Response: 100 Trying

    Provisional Response: 101 Progress Report

    Diagnostics: Error ID=12006

       Reason=Trying next hop

       Source=FrontEndOCS

       appname=OutboundRouting

       phoneroute=Route

       phoneusage=CN={******************************************},CN=Phone Route Usages,CN=RTC Service,CN=Microsoft,CN=System,DC=tsvc, DC=lab,DC=com

       gateway=FrontEndOCS:5061

    Provisional Response: 183 Session Progress

    Session State: Connecting->Connected

    Session State: Connected->Idle

     

    Friday, January 11, 2008 8:35 PM

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    Hi Jo,

    You may want to check CallManager & the gateway to be sure that you have an available outbound channel. That could account for the hit/miss nature. Do you even see the attempt on CallManager, or is the call not making it that far?

     

    Also, I suggest taking taking some network traces (sniffer) on your Mediation server and making sure that you are able to see it successfully making the connections. If you are having problems connecting, it will show up there.

     

    Lastly, do you have any way to see if your Firewall is configured to allow TCP and UDP & all the correct port ranges? I am assuming you put in some sort of request to have the F/W configured, but you may want to verify.

     

    Regards,

    Matt

     

     

    Monday, January 14, 2008 9:53 PM
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    Hi Matt,

    Took me a while to respond. 

    We are no longer experiencing this issue or if it is occuring nobody is reporing the issue.  The only change that occured was the upgrade of the CM, so I'm a little baffled on what was causing the issue.

     

    I did have an issue with the PSTN calls dropping after 15 minutes (exactly).  We added another NIC to our mediation server and did not have firewall rules set up for that IP address, so a SIP BYE was being sent to the Mediation server 15 minutes into the call. Have to love firewalls, cant live with them and can't live without them!

     

    Jo

     

    Tuesday, March 4, 2008 7:10 PM