Hi,
DTMF will not pass reliably through *any* low bit rate codec, with the
exception of some forms of ADPCM. GSM certainly does not work. When a
VoIP system is configured properly it works just like a cellular
telephone system, which suffers the same problem. It doesn't send the
DTMF tones.
Message-
From: [EMAIL PROTECTED] [mailto:asterisk-users-
[EMAIL PROTECTED] On Behalf Of Steve Underwood
Sent: Saturday, May 08, 2004 11:22 PM
To: [EMAIL PROTECTED]
Subject: Re: [Asterisk-Users] Low Bit Rate Codecs
Craig wrote:
Greetings all,
I have searched all over and have found
If you take into consideration the need to pass DTMF to/from various SIP
providers, how do they rank?
I'd given up on g729 completely because none of the dtmfmode options
seemed
to work with g729 for several sip service providers. GSM seems to work
fine
in general.
rfc2833 should work if
brian k. west wrote:
nasty. The higher rate (6.something kbps) sounds more reasonable. Using
30ms blocks, it is not so compatible with *, which is geared to 20ms
block processing. A lost packet causes a 30ms hole, so it tends to be
less tolerant of packet loss than something working in smaller
Thanks Steve, that was good reading.
- Original Message -
From: Steve Underwood [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, May 08, 2004 9:21 PM
Subject: Re: [Asterisk-Users] Low Bit Rate Codecs
Craig wrote:
Greetings all,
I have searched all over and have found
nasty. The higher rate (6.something kbps) sounds more reasonable. Using
30ms blocks, it is not so compatible with *, which is geared to 20ms
block processing. A lost packet causes a 30ms hole, so it tends to be
less tolerant of packet loss than something working in smaller blocks.
It
Greetings all,
I have searched all over and have found bits and pieces on low bit rate
codecs, however I have found it very difficult to compare apples with
apples.
The conclusions I have come to are as follows, I would appreciate if
anyone has some feedback, or point me to where I might find
Craig wrote:
Greetings all,
I have searched all over and have found bits and pieces on low bit rate
codecs, however I have found it very difficult to compare apples with
apples.
The conclusions I have come to are as follows, I would appreciate if
anyone has some feedback, or point me to where I
