See RFC 3398 section 7.3.

> -----Original Message-----
> From: [email protected] [mailto:sip-
> [email protected]] On Behalf Of Md Faruk Apel
> Chowdhury
> Sent: Thursday, March 31, 2011 2:56 AM
> To: [email protected]
> Subject: [Sip-implementors] Does ISUP have any equivalent for ACK
> message
> 
> 
> 
> Call from SIP to PSTN
> 
> 
> 
> SIP client-----------------MGC---------------------PSTN
> 
> ----------INVITE---->             ----------IAM------------->
> 
> ----------180---------------------------ACM----------------------
> 
> ----------200---------------------------ANM---------------
> 
> ----------->ACK ----------->   ------What is in ISUP message for ACK
> 
> Is there anything to send towards PSTN for ACK?
> 
> 
> Appreciate for prompt response from anybody.


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