[SIPForum-techwg] Cseg number

[Wang Chen Kuang-Voice]

Hi People,

               Can somebody help me? my question is number of CSeq of
one party "must" be sequence(i.e CSeq(current)=CSeq(last)+1)?




My Call Flow

>A=UA1
>P=Proxy
>B=UA2
>  
>
>A                                            P                                   B
> ----------------invite(Cseg=3)------------>
>                                                 
>                                               ----------------invite------------>
>                                                
>                                               <---------------Trying-------------
><-------------trying------------------------
>                                                
>                                               <--------------ring----------------
><-------------ring--------------------------
>                                               <-------------200ok----------------
><------------200ok--------------------------
>-----------------ack(Cseg=3)--------------->
>                                                 
>                                                ----------------ack--------------->
>------------invite of hold(Cseg=4)--------->
>                                                 
>                                                ----------------invite------------>
>                                                 
>                                                <-----------------Trying-----------
><-----------trying--------------------------
>                                                 
>                                                <----------------200ok-------------
><---------------200ok-----------------------
>-------------------ACK(Cseg=4)------------->
>                                                  
>                                                 ------------------ACK------------->
>--------refer(Cseg=5)---------------------->
>                                                  
>                                                 -----------------Refer------------>
>                                                 
>                                                 <-------------acceptded------------
><----------------accepted-------------------
>                                                 
>                                                 <---------------notify-------------
><-------notify(Cseg=3)----------------------
>------------------200ok-------------------->
>                                                  
>                                                 ------------------200ok----------->
>  --------bye(Cseg=8(?!))----->           it is correct?
>  
>


Best regards 

Wang Chen Kuang