topic Re: LUA Script to modify contact header in Call Control

LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 14:35:48 GMT

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

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 14:57:49 GMT

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

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

Re: LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 15:01:13 GMT

Hi Jonathan,

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

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 15:04:54 GMT

No problem, give me a few minutes

Re: LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 15:05:51 GMT

Excellent, thanks

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 15:21:53 GMT

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

Invite?

Any?

Other?

And in outbound direction or inbound?

Re: LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 15:24:29 GMT

Hello,It is possible in the Register?

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

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 15:29:01 GMT

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

Also, is this inbound to CUCM or outbound?

Re: LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 15:31:42 GMT

If only to register, and inbound to CUCM

Regards

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 15:36:20 GMT

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…

Re: LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 15:49:13 GMT

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

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?

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 15:53:54 GMT

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.

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 16:15:09 GMT

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

Re: LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 17:26:48 GMT

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

Attached the log

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 17:29:05 GMT

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.

Re: LUA Script to modify contact header

Jonathan Els — Mon, 07 May 2018 17:32:01 GMT

I'm not sure what this is, but you haven't shared an SDL trace. Please download using RTMT...

Re: LUA Script to modify contact header

fgleanza — Mon, 07 May 2018 17:39:00 GMT

Ok, thanks

Re: LUA Script to modify contact header

Jonathan Els — Tue, 15 May 2018 20:15:57 GMT

Hi,

I've had confirmation that they are supported for phones as well (am still confirming 3rd-party device support). Can you please apply to the SIP Profile for the device, and do an SDL capture and share this? I reckon we should be able to get this working, or at least do an analysis and check!

Re: LUA Script to modify contact header

david.alfaro1 — Fri, 10 May 2024 20:55:18 GMT

I think it is better to have the original trace of the REGISTER message, in my case, I have "q=1", not "q = 1". it is case sensitive.