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Raymond_Feng_97's avatar
Raymond_Feng_97
Historic F5 Account
Apr 20, 2005

How to use irules to do SIP outbounding proxy?

Hi, everyone

 

I am trying to do SIP proxy server loadbalance. By now, we can do loadbalance for inbound SIP request, I mean , from the client to the proxy server , just using SIP persistant.

 

The problem is, when the proxy serverA send outbound SIP request to the remote SIP serverC with one call-ID,the remote SIP serverC response packet is to the inbound virtual server with the same call-ID. But our bigip fail to send this response back to serverA ,since there is no SIP persistant information for this call-ID.

 

So, can we use irules to write one new persistant information at our SIP persistant table when serverA to send outbound SIP packet? I mean , when ServerA to send outbound SIP packet, we use irules to write one persistant information, call-ID and the serverA IP (Souce IP).So when the response packet back , bigip can found at persistant table, and send the responce back to serverA.

 

 

Thanks,

 

Raymond
application delivery
dev
devops
iRules

17 Replies

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Nov 09, 2006
    Can you post your rule, any relevant logs and a description of the issue you're seeing?
  • Paul_71209's avatar
    Paul_71209
    Icon for Nimbostratus rankNimbostratus
    Jan 28, 2008
    Any updates to this? My network requires the same functionality.

     

     

    Thanks!

     

    Paul

     

  • Nat_Thirasuttakorn's avatar
    Nat_Thirasuttakorn
    Icon for Employee rankEmployee
    Jan 28, 2008
    I think session command with keyword "any" may help.

     

    call-id can be detected on the returning traffic by iRule and session command can be used to save persistence record, for example,

     

     

    session add uie [list $sessionid any] [list [IP::remote_addr] 5555] $::sessionTimeout

     

     

    (keyword "any" allows this record to be used by any virtual server)

     

     

    I am not sure if the record that is being added by session command can be used by normal call-id persistence or not. (probably need to use appropriate syntax for address/port I guess) however, we can use "session lookup" command to lookup for the existing record also.

     

  • Ulf_Wätterstam's avatar
    Ulf_Wätterstam
    Icon for Nimbostratus rankNimbostratus
    Feb 25, 2008
    Hi,

     

    Did you make this work?

     

    We do something similar and have found out some things that can be good to know for anyone trying to load balance sip.

     

     

    For me it felt natural to use mode because I was working with sip but that did not work together with keyword any

     

    Example

     

    On vs_1

     

    session add sip [SIP::call_id] [LB::server addr] 180

     

    session add uie [SIP::call_id] [LB::server addr] 180

     

     

    On vs_2

     

    session lookup sip "[SIP::call_id] any virtual"

     

    This do not get back the stored value

     

    session lookup uie "[SIP::call_id] any virtual"

     

    But this do..

     

     

    Simply use uie instead of sip, but it is strange that it did not work with mode sip.

     

     

     

    Another thing that can be confusing is that when you choose a sip profile in your vs you will get the SIP::call_id as persistence value even though you choose None as your Default Persistence Profile. I'm not sure this make a different but we created a SIP persistence profile that never match and used that insted. With this we only have the values we set and want to use.

     

     

     

    All this is valid for 9.4.3, I do not know if it is updated in any hotfix or in 9.4.4. Does anyone know?

     

     

  • Nicolas_Menant's avatar
    Nicolas_Menant
    Icon for Employee rankEmployee
    Feb 26, 2008
    Hi,

     

     

    I saw the same thing.

     

     

    When you use session commands, don't use sip mode because it doesn't seem able to share the session data with another vs.

     

     

    use another mode.
  • zafer's avatar
    zafer
    Icon for Nimbostratus rankNimbostratus
    Jun 04, 2008
    Hi

     

     

    Could you please share your rule?

     

     

    zafer