[Asterisk-Users] CODEC & DTMF

[Jamie Carl]

Hopefully these are all correct:

-No, a SIP phones cannot connect to Asterisk voicemail 
using G.729 if you do not have a licence.  You will need a 
licence for at least one channel to do this.
-DTMF is not related to the codec itself or how it works, 
however, inband DTMF is not recommended on compressed 
channels due to the possibility of distortion.  Outband is 
the way to go as the tones are capture and then 
regenerated locally.

Inband signaling is achieved thought the telephony voice 
channel, while outband is through some other type of 
communication channel. In the case of SIP it is the INFO 
method.

Hope this helps,

J

On Thu, 14 Aug 2003 09:03:15 -0700
  "George Lin" <glin at cosini.com> wrote:
>*This message was transferred with a trial version of 
>CommuniGate(tm) Pro*
>
>Dear all,
>
>I like to know if the DTMF option is related to the codec 
>or not. Can a SIP
>phone with g729 codec to access asterisk voicemail2 in 
>case the asterisk
>does not have g729 license ?? If yes, what is the DTMF 
>option inband or
>outband ??? Is there any successful experience ???
>
>Regards,
>
>George Lin
>
>_______________________________________________
>Asterisk-Users mailing list
>Asterisk-Users at lists.digium.com
>http://lists.digium.com/mailman/listinfo/asterisk-users

Regards,

Jamie Carl
Jazz Inc.
Email:  me at jazz-inc.net
Web:    www.jazz-inc.net
Phone:  +61-414-365-466
Jabber: jazz at netmindz.net