[asterisk-ss7] possible overlapped dial bug in chan_ss7

[Ngo-Vi Hoai-Anh]

Dear chan_ss7 users,

I've bumped into a problem when using chan_ss7 1.0.0 in Germany. 
Overlapped dialing didn't work properly.

The relevant ss7 configuration reads

...
enable_st => yes
t35 => 4000,st

Asterisk configuration reads
...
exten => _0X.,1,Dial(ss7/myss7/${EXTEN:1})
...

The DTM switch is configured  to signal incoming calls to Asterisk when 
it receives min. 7 digits.

If I dial a number longer than 7 digits using an analog handset. 
Asterisk tried to make ougoing call as soon as it has received 7 digits. 
Everything is OK if I use a digital handset, where the number is sent as 
a block.

After having traced the debug output I've found out when I call using 
analog handset the inmsg->iam.dni.complete is set to 0 but the function 
process_iam() calls check_iam_sam(pvt) anyway.

I've modified the code a bit and it works fine for me now. The 
modification is to be found in the attached patch file.

I'm very grateful if someone can take a look at my modification and 
gives feedback.

Cheers,
Hoai-Anh
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