[cisco-voip] SIP-Trunk with To-Header

[Mark Holloway]

What you are describing is referred to as "SIPconnect" and is a very common method for supporting IP PBX SIP Trunking in the carrier space. 

Read more here

http://www.sipforum.org/sipconnect


 

On Mar 16, 2010, at 2:08 AM, Jefflin Choi wrote:

> It seems like the SBC has the capability to re-edit therequest-URI so
> my problem is solved. Anyway, i still want to know if this is possible
> in case i encounter similar scenario on future implementation where
> sip provider still uses TO - field.
> 
> Thanks in advance.
> 
> 
> On Tue, Mar 16, 2010 at 4:07 PM, Jefflin Choi <jefflin.choi at gmail.com> wrote:
>> Hi,
>> 
>> Cisco seems to use Request-URI for incoming calls. Our SIP providers
>> seems to use to-field.
>> 
>> From  logs, it seems the request-URI and To field that provider is
>> sending are different. Provider is claiming that they can't edit the
>> request-uri field. I am still asking them to doublecheck.
>> 
>> I know that they are not conforming with rfc3261 .. " The initial
>> Request-URI of the message SHOULD be set to the value of the URI in
>> the To field."
>> 
>> Anyhow, just would like to ask if the CCM7 has a way to use the
>> to-field instead of request-URI.
>> 
>> Thanks,
>> Jeff
>> 
> 
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