Greetings,
What is the recommended settings for using SPA-3000's FXO port for
dialing out to PSTN in regard of the DTMF?
The voip lan contains SPA-2100 and SPA-3000, with all fxs/fxo ports
registered to the Asterisk box with unique username/passwords.
The inbound PSTN DTMF works excellently, e.g. people calling from PSTN
into the * box are able to pick IVR items with DTMF reliably.
The problem manifests itself when you attempt to place a call via
SPA-3000's FXO into PSTN to a different IVR system and try to navigate
its menu. Audibly, the other end hears very short DTMF bursts with short
silence afterwards, as like SPA-3000 detects a DTMF, mutes it and sends
rfc2833 or whatever. Obviously, the burst is short enough to be ignored
by the remote IVR system (similar Asterisk/SPA-3000 setup).
The relevant settings in the SPA-3000/2100 config for DTMF are set to
'Auto' setting.
The relevant lines in sip.conf:
;-------
[general]
;irrelevant lines removed
dtmfmode=rfc2833
disallow=all
allow=alaw
allow=ulaw
allow=g729
[111]
;SPA-3000 FXO port
type=friend
username=111
secret=xxx
host=dynamic
[112]
;SPA-3000 FXS port
type=friend
username=112
secret=xxx
host=dynamic
[113]
;SPA-2100 FXS1 port
type=friend
username=115
secret=xxx
host=dynamic
[114]
;SPA-3000 FXS2 port
type=friend
username=114
secret=xxx
host=dynamic
;-------
Should I instead split the SPA-3000's FXO entry into a type=user and
type=peer entries with the first having dtmfmode=rfc2833 and second
dtmfmode=inband?
Which is the proper way of sending inband dtmf over g711 into the PSTN?
Awaiting assistance and thanks for your time,
Vahan
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