[asterisk-users] Asterisk to Asterisk access voicemail - not working

[Ivan Stepaniuk]

Joseph wrote:
> I just double checked the setting of the remote asterisk and it has the same setting as mine.
> Sip.conf has in Global:
> dtmfmode = rfc2833
> individual extension has no dtmf setting at all, so global setting take precedence.
>
> All units Linksys, Sipura have 
> DTMF Tx Method: Auto
>
> Linksys has an additional setting:
> DTMF Tx Mode: Strict
>
> My asterisk is using old Sipura units and dtmf tones to access voicemail are recognized.
> The remote asterisk is using newer Linksys units and dtmf to voicemail does not work, the phone hangs up.  
>
> The strange part is:
> PSTN --> Asterisk (voicemail access) works OK on both sytemes.
> Asterisk (w/Linksys) --> Asterisk (w/Sipura) to Voicemail works OK
> Asterisk (w/Linksys) --> Asterisk (w/Linksys) to Voicemail DOES NOT work
> Asterisk (w/Sipura) -->  Asterisk (w/Linksys) to Voicemail DOES NOT work
>   
You are using the ATAs to access from one Asterisk to the other one? 
Wouldn't make sense to connect those two asterisk through SIP or IAX via 
Internet instead of calling via PSTN anyway?

Anyway, In this case it seems that this is not asterisk related, try the 
several Sipura/Linksys settings  related to DTMF, also if the asterisk 
boxes are the only thing your ATA connects to, there is no point on 
using the "auto" mode. 

Check the "relaxed" dtmf setting on yhe linksys, and also check the 
Impedance, Rx and Tx gain, As well as the DTMF duration, All this 
"knobs" can mess up your DTMF tones if there is something wrong. Just

-- 
Iván Stepaniuk
Alba Fotónica S. L.
www.albafotonica.com