Forum Discussion
Joss_100621
Nimbostratus
NimbostratusSIP TLS transformation
Hi,
We are using bigip to terminate SIP/TLS sessions and forward it over TCP to a SIP server.
We need to replace the sips: uri coming from the client to sip: towards the server otherwise the server rejects the request.
of course the opposite transformation (from sip to sips) has to be made on traffic from server to client.
Here is a sample message from client:
REGISTER sips:xxx.xxx:5061;transport=TCP SIP/2.0
From: ;tag=b660828-b1040a0a-13c5-55016-57053-645b33cc-57053
To:
Call-ID: b67dee8-b1040a0a-13c5-55016-57053-378dbf4e-57053
CSeq: 1 REGISTER
Via: SIP/2.0/TLS w.x.y.z:5061;rport;branch=z9hG4bK-57053-153ec597-148752e
Max-Forwards: 70
Supported: replaces,100rel,timer,eventlist
User-Agent: xxx
Require: pref
Expires: 3600
Contact: ;
Content-Length: 0
Do you have any idea on how to achieve this?
Thanks.
11 Replies
hoolioCirrostratus
Hi,
Can you try the SIP::header commands (Click here) to save, remove and insert a new version of the headers? You could use string map to replace sips: with sip:.
set sip_from [string map -nocase {sips: sip:} [SIP::header From]]
SIP::header remove From
SIP::header insert From $sip_from
Aaron
Joss_100621Thanks for that.
Do you know how to change to change the request uri line: REGISTER sips:xxx.xxx:5061;transport=TCP SIP/2.0 ?- hoolioSIP::uri can be used to retrieve/modify the URI.
Aaron - Joss_100621Per the documentation this is only to retrieve the request uri and not to set it.
if I try something like:
set sip_uri [string map -nocase {sips: sip:} [SIP::uri]]
SIP::uri remove
SIP::uri insert To $sip_uri
It fails to parse. - hoolioSorry, from this post (Click here) I thought the functionality might have been changed. I'm not sure whether/how you can modify the SIP URI if not with SIP::uri. You could open a case with F5 Support and ask. There are a few people who have asked:
Replace IP address in SIP Notify in iRule
http://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&tpage=1&view=topic&postid=86218
SIP content modification
http://devcentral.f5.com/Default.aspx?tabid=53&forumid=5&tpage=1&view=topic&postid=1880118802
How to modify SIP::uri
http://devcentral.f5.com/Default.aspx?tabid=53&view=topic&postid=33065&ptarget=33065
If you find any more info on this, can you reply here for future reference?
Thanks,
Aaron - In 9.4.8 this should work
when SIP_REQUEST {
SIP::uri
} - hoolioHi Michael,
Thanks for the tip. Was this change made in 9.4.8 and 10.0.0? I tried searching on AskF5 but didn't find anything related. The wiki still shows SIP::uri can only retrieve the value.
Thanks,
Aaron - I don't know. IT was the response in a subcase sent to Dev.
It is not documented. - Joss_100621Hi All,
Its confirmed to be working on 9.4.8
It looks like a documentation bug.
I have used the following to transform the sips URI to sip:set sip_uri [string map -nocase {sips: sip:} [SIP::uri]] SIP::uri $sip_uri
Thanks a lot for your tips, it was absolutely invaluable. - I received this answer in my subcase.
This ability was added to SIP::uri in 9.4.0, so it should be there in all
9.4.x and 10.x.x versions.
