The IETF GIN standard for SIP was developed for this use-case, and it’s part of 
SIPconnect from SIP forum.

/O

> On 19 Jan 2023, at 15:30, Alex Balashov <[email protected]> wrote:
> 
> The proper place is the user part of the Request URI (R-URI).
> 
>> On Jan 19, 2023, at 9:05 AM, Carlos Escalona <[email protected]> 
>> wrote:
>> 
>> Hello all! I have a question. In my system we use a series of VoIP providers 
>> to receive external calls to our telephone numbers, for the same provider we 
>> have several registered numbers and we need our providers to send that 
>> information in some way, so far it does not seem that there is a common way 
>> to do it (report the number that was dialed by the person who made the 
>> call). From what I understand, SIP does not have a place for that 
>> information because there are no things like phone numbers in the 
>> specification, my question is, is there a correct place to send such 
>> information, or is it entirely up to each provider? (Now, the most common is 
>> to have in the RURI and To header, the id of the trunk registered in the 
>> uacreg table) I have seen a couple of options that seem to me the most 
>> “correct”: send the information in the To header or send in a custom header.
>> 
>> I really appreciate any help you can provide.
>> 
>> Atenciosamente,
>> 
>> 
>> Carlos Escalona
>> IT - Development
>>  41 3073-0091 | R 1011  www.techer.com.br
>> 
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> -- 
> Alex Balashov
> Principal Consultant
> Evariste Systems LLC
> Web: https://evaristesys.com
> Tel: +1-706-510-6800
> 
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