Hello,

to clarify a bit more on the original question: it is indeed allowed to
have a port in the To header URI, but it is not required to have a port
in the To header URI.

>From that perspective, you can consider that you are "not forced" to set
a port in there, the SBC has to work with a To URI without port.

Usually the issue in such case is that they configured the SBC to use
the To URI for routing, which is a wrong approach, they must use R-URI
for routing.

Cheers,
Daniel

On 24.01.23 09:02, Henning Westerholt wrote:
> Hello,
>
> usually, you have a in the To header an URI, and this can of course contain a 
> port:
>
> SIP-URI          =  "sip:" [ userinfo ] hostport
>                     uri-parameters [ headers ]
> SIPS-URI         =  "sips:" [ userinfo ] hostport
>                     uri-parameters [ headers ]
>
> For more information refer to e.g. section 25 of RFC 3261.
>
> Cheers,
>
> Henning
>
> -----Original Message-----
> From: Olivier <[email protected]> 
> Sent: Tuesday, January 24, 2023 8:22 AM
> To: [email protected]
> Subject: [SR-Users] [SR-Users]: Port number in To: field
>
> Hello,
>
> While trunking with an Oracle SBC, I was lately required to include a port 
> number in INVITE To: field.
>
> Would you qualify this as a "legal requirement" (according to SIP Standards) ?
>
> Best regards
> __________________________________________________________
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Daniel-Constantin Mierla -- www.asipto.com
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