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

[Tian]

Hi Hans,

Since an ST address signal is always added to the last digit of the called 
party number (Is this really the case, at least in the ITU version?), I 
guess ST is used by the last SAM to indicate that it is the last one. As I 
failed to find any standard that documents this behavior clearly, I doubt 
whether it is the right answer and I hope some guy will kindly help me out 
with this issue!

Thanks!

--------------------------------------------------
From: "Johann Steinwendtner" <steinwendtner at gmx.net>
Sent: Monday, October 12, 2009 2:30 PM
To: <asterisk-ss7 at lists.digium.com>
Subject: Re: [asterisk-ss7] A question about ISUP SAM message usage

> Tian schrieb:
>> 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 depends on the type of called party I guess. If the called party 
> supports
> a message like "end of digit collection" than this would be translated
> into an ACM message. e.g. if the called party is an ISDN interface
> terminating to a PBX, the pbx would send a call proceeding or an alert
> which will then be translated to an ACM.
> If there is no "end of digit collection", than an End of dial (EOD) timer
> will be used.
> It depends totally on the type of gateway.
>
> Best regards
>
> Hans
>
>
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