LUA Script to modify contact header

[fgleanza]

Dear, I need to make a script to modify the contact header field,

I need to remove the string "+ sip.instance =" <urn: uuid: 832028f41e6258c46e8de1e8dd3d6723360b5c74> "; reg-id = 1"

String before normalizing:

Contact: <sip: 3001@10.0.1.56: 50772>; + sip.instance = "<urn: uuid: 832028f41e6258c46e8de1e8dd3d6723360b5c74>"; reg-id = 1

String after normalizing

Contact: <sip: 3001@10.0.1.56: 50772>; q = 1

Could you help me put the script together?

Thank you very much

[Jonathan Els]

Can you confirm where you're getting q = 1?

Is that static or dependent on the reg-id value?

[fgleanza]

Hi Jonathan,

I need to add that value q=1 at the end of the string, is that possible? This value the constant

[Jonathan Els]

No problem, give me a few minutes

[fgleanza]

Excellent, thanks

[Jonathan Els]

Last question.. in what messages do you want this applied?

Invite?

Any?

Other?

And in outbound direction or inbound?

[fgleanza]

Hello,It is possible in the Register?

REGISTER sip:10.57.0.99 SIP/2.0

Via: SIP/2.0/UDP 10.0.1.56:50772;branch=z9hG4bK-524287-1---5987c626fa82397b;rport

Max-Forwards: 70

Contact: <sip:3001@10.0.1.56:50772>;+sip.instance="<urn:uuid:832028f41e6258c46e8de1e8dd3d6723360b5c74>";reg-id=1

Thanks

[Jonathan Els]

should work in a register message... do you want to only apply this to register?

Also, is this inbound to CUCM or outbound?

[fgleanza]

If only to register, and inbound to CUCM

Regards

[Jonathan Els]

ok, this should work for you:

M = {}

trace.disable()

function M.inbound_REGISTER(msg)

    local contact = msg:getHeader("Contact")

    if contact

    then

        local qval = "q = 1"

        contact = contact:gsub("(.*<sip:.*>);.*", "%1" .. "; " .. qval)

        trace.format("Found contact header... modifying to: %s", contact)

        msg:modifyHeader ("Contact", contact)

    end

end

return M

looks for contact header, if it finds it, it updates to strip out everything after <sip:.*>, and concatenates "; q = 1"

For  your own knowledge, the relevant API guide for this is here:

Developer Guide for SIP Transparency and Normalization - SIP Messages APIs [Cisco Unified Communications Manager (CallMa…

[fgleanza]

Thanks, I tried it but the modification was not made.

REGISTER sip: 10.57.0.99 SIP / 2.0

Via: SIP / 2.0 / UDP 10.0.1.106:57477;branch = z9hG4bK-524287-1---f0fbbe4b26111c40;rport

Max-Forwards: 70

Contact: <sip: 3001@10.0.1.106: 57477>; + sip.instance = "<urn: uuid: 832028f41e6258c46e8de1e8dd3d6723360b5c74>"; reg-id = 1

To: "Fernando" <sip: 3001@10.57.0.99>

From: "Fernando" <sip: 3001@10.57.0.99>; tag = ae39740c

Call-ID: 75944M2YyMjNmMzIxMmE5ZTJlYTMzNGUxY2IyYzdiMDhlMDk

CSeq: 1 REGISTER

Expires: 3600

Allow: SUBSCRIBE, NOTIFY, INVITE, ACK, CANCEL, BYE, REFER, INFO, MESSAGE

Supported: outbound, path

User-Agent: X-Lite 4.8.0 75944-8638137a-W6.2

Content-Length: 0

because it can be?

[Jonathan Els]

Did you reset the SIP Trunk after applying the lua script??

Please share the SDL file.  also, please enable tracing for the script on CUCM.

[Jonathan Els]

Also, just to confirm, you are applying this to a SIP Trunk?  Not sure what your REGISTER flow is through the trunk.

[fgleanza]

This script is associated with a sip profile that has a third-party device.

Attached the log

[Jonathan Els]

This is what I thought.  I'll have a look at the SDL trace to confirm, but I'm pretty sure that what you're trying to do is not supported.  I think the Lua scripts are only available for SIP Trunks.