Re: [reSIProcate] WS and invalid contact

[Scott Godin <sgodin@xxxxxxxxxxxxxxx>]

Are you using repro?  repro get's around this problem (when properly configured), by ensuring that Record-Route headers are placed in the forwarded INVITE, so that the mid-dialog requests go back through repro.  The resulting Route headers coming back to repro have all the information needed in order to find the TCP connection and send back to the WS client.  It uses mechanisms discussed in RFC5626.

Best Regards,

Scott

On Fri, Jul 3, 2015 at 2:03 PM, Diego Carvalho Domingos <ddomingos@xxxxxxxxxxxxxxx> wrote:

Hi all,

 

I’ve successfully established a WS connection between JsSIP and resiprocate. My issue is that, since the browser cannot know its own IP, it uses a <random string>.invalid as contact, and then when I try to send a BYE from resiprocate side it fails because resiprocate can’t DNS resolve that contact.

After some search I found that WS support in resiprocate was a patch from doubango and in the initial commit there was a class called WsDecorator that would inspect the outgoing sip messages and replace the invalid contact and VIA header by the IP and port of the connection. But in the following commit the usage of that class was removed:
https://github.com/resiprocate/resiprocate/commit/017992d353f0038d1d24a655c918dd2c91e764c0
Two things to notice:

1)      The class is still in the repository but it is not used anymore

2)      The class searches for a specific string (df7jal23ls0d.invalid). This is the one used by sipML5 but it is not the one used by JsSIP (random before the .invalid), so the code is not generic

Then I tried to put the code back but it wasn’t being called (maybe this is why it was removed). Then I tried to add the decorator in the master profile as explained here:

https://www.resiprocate.org/Modifying/Decorating_messages_sent

The decorator was called when sending the 180 and 200 but not when sending the BYE. I think the reason is because decorators are called only when the message is about to be sent and in this case, since the DNS fails, it is not called. I need to modify the message before the DNS query (actually, if I modify it there will be no DNS query since I’ll replace for an IP).

 

Has anyone experienced this problem? It seems that this is a common issue. I appreciate any help. Thanks in advance.

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