[SIPForum-discussion] How SIP call can be diffrentiated based on Class4 and Class5 switch calls

Eric Burger eburger at sipforum.org
Wed Dec 2 11:57:38 UTC 2009

In SIP there is no distinction -- Class n was about the PSTN routing  
hierarchy. SIP uses an entirely different (flat) routing model.

On Dec 1, 2009, at 7:00 AM, Kshitij Bhushan wrote:

> Hi All,
> One basic question?
> How we are distinguishing the class4 and class5 switch call in SIP? 
> Is through NOA or some access layer or something else.
> Pls reply!!!!
> Thanks in advance.
> Kshitij.
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