LUA script to modify privacy inbound invite

Gaurav Purohit — Tue, 04 Apr 2017 01:19:46 GMT

Hi,

I'm struggling to get my LUA script to work. The RightFax server on other end does not allow SIP parameters to be altered and sends a basic invite with no privacy option. I'd like to alter my inbound invites to add P-Asserted-ID and alter From field. Here is my LUA script:

M = {}
trace.enable()
function M.inbound_INVITE(msg)
--get Header Values
local uriString = msg:getUri("From")
local nuri = sipUtils.parseUri(uriString)
trace.format("Parse success")
local nUser = nuri:getUser()
trace.format("user is '%s'", nUser)
local nHost = nuri:getHost()
trace.format("host is '%s'", nHost)
--get tag from From header
local fromtag = msg:getHeaderValueParameter("From", "tag")
trace.format("tag from From is '%s'", fromtag)
--create new from header
local newFromHeader = string.format("\"Anonymous\" <sip:Anonymous@%s>;tag=%s\r\n", nHost, fromtag)
trace.format("new From Header is '%s'", newFromHeader)
msg:modifyHeader("From", newFromHeader)
trace.format("From Header is updated successfully")
--create Remote party ID string with privacy
local newRPartyHeader = string.format("<sip:%s@%s>;party=calling;id-type=subscriber;privacy=full;screen=yes\r\n", nUser, nHost)
trace.format("header string created '%s'", newRPartyHeader)
--Add Remote party ID (not added for now)
--msg:addHeader("Remote-Party-ID", newRPartyHeader)
local newPAIHeader = string.format("\"RightFax\" <sip:%s@%s>\r\n", nUser, nHost)
trace.format("PAI header string created '%s'", newPAIHeader)
msg:addHeader("P-Asserted-Identity", newPAIHeader)
local ids = string.format("id\r\n")
trace.format("Adding ID")
msg:addHeader("Privacy", ids)
trace.format("All Done\r\n")
end
return M

Original Invite from RightFax:

INVITE sip:0385410508@172.22.5.31 SIP/2.0
From: Rightfax Dev <sip:0397277670@172.22.31.185>;tag=8be2690-b91f16ac-13c4-55013-312cf8-26efef6b-312cf8
To: <sip:0385410508@172.22.5.31>
Call-ID: 776a928-b91f16ac-13c4-55013-312cf8-70e1aefd-312cf8
CSeq: 1 INVITE
Via: SIP/2.0/UDP 172.22.31.185:5060;branch=z9hG4bK-312cf8-c017a9f1-27c0c9e1
Supported: 100rel
Max-Forwards: 70
User-Agent: Brktsip/6.5.2B5 (Dialogic)
Contact: <sip:172.22.31.185:5060>
Content-Type: application/sdp
Content-Length: 150

v=0
o=- 2212556890 0340060000 IN IP4 172.22.31.185
s=no_session_name
t=0 0
m=audio 56300 RTP/AVP 0
c=IN IP4 172.22.31.185
a=rtpmap:0 pcmu/8000

Altered Invite from RightFax:

INVITE sip:0385410508@172.22.5.31 SIP/2.0
From: "Anonymous" <sip:Anonymous@172.22.31.185>;tag=8be2690-b91f16ac-13c4-55013-312cf8-26efef6b-312cf8

P-Asserted-Identity: "RightFax" <sip:0397277670@172.22.31.185>

Supported: 100rel
Content-Length: 150
User-Agent: Brktsip/6.5.2B5 (Dialogic)
Privacy: id

To: <sip:0385410508@172.22.5.31>
Contact: <sip:172.22.31.185:5060>
Content-Type: application/sdp
Call-ID: 776a928-b91f16ac-13c4-55013-312cf8-70e1aefd-312cf8
CSeq: 1 INVITE
Via: SIP/2.0/UDP 172.22.31.185:5060;branch=z9hG4bK-312cf8-c017a9f1-27c0c9e1
Max-Forwards: 70

v=0
o=- 2212556890 0340060000 IN IP4 172.22.31.185
s=no_session_name
t=0 0
m=audio 56300 RTP/AVP 0
c=IN IP4 172.22.31.185
a=rtpmap:0 pcmu/8000

Error:

SIP/2.0 400 Bad Request - 'Malformed/Missing FROM: field'

Re: LUA script to modify privacy inbound invite

Mark Stover — Tue, 04 Apr 2017 13:57:14 GMT

Try removing ‘\r\n’ from your formatted strings. The header functions will insert those correctly.

Re: LUA script to modify privacy inbound invite

Gaurav Purohit — Wed, 05 Apr 2017 02:56:29 GMT

Thanks heaps!

Can't believe I was so close.

topic Re: LUA script to modify privacy inbound invite in Call Control

LUA script to modify privacy inbound invite

Re: LUA script to modify privacy inbound invite

Re: LUA script to modify privacy inbound invite