SIP Normalization Script example to remove the advertised Update in the Allow

[Doug von Holtz]

Unfortunately we do not have a CUBE in the call flow. If we did I would use the following to perform what i need to accomplish:

voice service voip

sip
  sip-profiles 1

voice class sip-profiles 1
request ANY sip-header Allow-Header modify " UPDATE," ""
response ANY sip-header Allow-Header modify " UPDATE," ""

However what we have is a SIP trunk directly from a CUCM 10.5 server to the CCE CVP. I understand i could remove the UPDATE from the allow in the header with a Normalization Script, does anyone have an example.

I believe it should look like the following:

1.    M = {}
2.    function M.inbound_INVITE(msg)
3.        msg:removeHeaderValue("Allow", " UPDATE")
4.    end
5.    function M.outbound_INVITE(msg)
6.        msg:removeHeaderValue("Allow", " UPDATE")
7.    end
8.    return M

Thank you in advance for any help

-Doug

[ryanticer]

What you have looks like it should work for the initial invites, don't forget the subsequent response messages to the INVITE though:

M = {}

function M.inbound_INVITE(msg)

    msg:removeHeaderValue("Allow", "UPDATE")

end

function M.outbound_INVITE(msg)

    msg:removeHeaderValue("Allow", "UPDATE")

end

function M.inbound_ANY_INVITE(msg)

    msg:removeHeaderValue("Allow", "UPDATE")

end

function M.outbound_ANY_INVITE(msg)

    msg:removeHeaderValue("Allow", "UPDATE")

end

return M

I recommend applying the profile and testing (I recommend on the trunk - the sip profile sip normalization selection doesn't work sometimes). You can use RTMT to grab CM traces and load them in to translator X to see how the SIP messaging turns out after the transformation.

Developer Guide for SIP Transparency and Normalization - Cisco

Thanks!

Ryan Ticer

[Doug von Holtz]

Ryan,

Thanks for the sanity check, I will test and let you know.

-Doug

[joshuastellar]

 ryanticer post worked for me!