[asterisk-ss7] A question about ISUP SAM message usage

[Tian]

As you know, when overlap signaling is used, when enough digits have been collected to identify the next exchange, an IAM is sent to the next exchange along the route to the called party, the remaining digits are sent in subsequent SAM messages.

My question is: how does the local exchange of the called party decide whether all digits of the called party number has been collected or not (i.e., how does the local exchange of the called party know whether or not the SAM it received is the last one), especially when the called party number is of variable length?

I looked through some of the ITU-T Q.76X series but failed to find the answer, I hope any of you will kindly help me answer my question or refer me to some information sources, thanks in advance!
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