[Users] TCP <---> UDP Conversion

[Daniel-Constantin Mierla]

Hello,

On 05/19/06 05:49, T.R. Missner wrote:
>
> Hello,
>
>  
>
> Is it possible to use openSER as TCP <--> UDP convertor?
>
yes, it is possible. OpenSER can perform transport layer conversion.
>
>  
>
> I have this working to a certain extent.
>
>  
>
> 1) UA -> TCP INV -> openSER -> UDP INV -> Carrier
>
> 2) UA <- TCP 200 <- openSER <- UDP 200 <- Carrier
>
> 3) UA -> TCP ACK -> openSER -> UDP ACK -> Carrier
>
>  
>
> Setup transaction works like it should.
>
>  
>
> My question is about subsequent transactions.
>
> In the 200 from Carrier (2) a parameter of transport=udp is set on the 
> contact header.
>
>  
>
> Now if the UA is running in an automatic protocol mode ( this would be 
> UA specific ), It honors the transport=udp param and sends a BYE or 
> re-Invite as UDP
>
The ua has to honor the Record-Route from 200OK, which would specify the 
TCP transport. The proxy is the one which has to honor the Contact 
header, being the one which delivers the message to that hop.

Cheers,
Daniel

>  
>
> 4) UA -> UDP BYE -> openSER -> UDP BYE -> Carrier
>
> 5) UA <- UDP 200 <- openSER <- UDP 200 <- Carrier
>
>  
>
> Is there a way to re-write the transport= param in the contact header 
> of the 200 ( msg 2 ) so it says transport=tcp Which would then allow 
> the subsequent request messages from UA to be sent tcp?
>
>  
>
> Would doing this break the rfc?
>
>  
>
> Is anyone using openSER to accomplish similar protocol conversion?
>
>  
>
> Thanks,
>
>  
>
> T.R.
>
>  
>
>  
>
>  
>
> ------------------------------------------------------------------------
>
> *T.R. Missner*
> /Director Enterprise VoIP Products/
> trmissner at bandwidth.com <mailto:trmissner at bandwidth.com>
> 919-439-3575 - Ph
> 925-888-2997 - Fax
>
> 	
>
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