Is it possible that the DTMF secondary dial tone cannot be detected if the G.729 codec mode is used

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The DTMF second dial tone may not be detected because the G.729 codec mode is a lossy codec mode.

Other related questions:
Is there a possibility that the AR cannot detect the DTMF tone using G.729
G.729 is a lossy audio data compression and may cause the AR's failure to detect the DTMF tone.

How to configure the secondary dial tone on the U1981?
1. When adding the office route selection code through the web management page, select the secondary dial tone. 2. When adding the office route selection code using commands, set the send2nddialtone parameter to yes. For example, to add the office route selection code 0 and enable the two-stage dialing service without initiating rerouting, run the following command: Config add office selectcode no 0 repeatroute No send2nddialtone Yes

A DSP module does not work properly
The problem may be caused by the following reasons: 1. The DSP DIMM module is not installed or not properly installed. 2. An audio license file is not installed on the system. For details, see the following URL: DSP无法正常工作

What is G.711 codec
The G.711 codec algorithm defines rules for encoding/decoding non-compressed waves. The input data is derived from PCM data whose sampling frequency and bit rate are 8000 Hz and 64 kbit/s respectively. Based on the companding rate adopted for signal quantizing, the G.711 algorithm is classified into G.711 A and G.711 μ. The difference between the two lies in the fact that G.711 A uses a companding curve of 13-fold lines, whereas G.711 μ uses a companding curve of 15-fold lines. The G.711 coder and decoder use a simple algorithm and compress signals by quantizing them in a nonlinear method, providing a short delay and high voice quality. However, the G.711 coder and decoder have a high data rate, which makes them sensitive to errors in transmission channels. UMG8900 supports the G.711 voice codec mode and the switchover between G.711 A and G.711 μ, and can interwork with PSTN networks.

What are the differences in the implementation mode between AAC-LD stereo and G.722 mono codecs on an endpoint?
G.722 is a monaural protocol. Currently, the ViewPoint 9000 series endpoint supports only the following stereo protocols: AAC-LD and HWA-LD. If the negotiation result is mono, the input audio channel with the higher volume is selected from the left and right input audio channels, the sound collected by this audio channel is transmitted to the peer site, and both the left and right audio channels at the remote site play this sound. If the negotiation result is stereo, both the left and right input audio channels are enabled on the web interface of the endpoint, and both the left and right input audio channels have sound input, sound is transmitted to the peer site, and both the left and right audio channels at the peer site play sound. If the negotiation result is stereo, both the left and right input audio channels are enabled on the web interface of the endpoint, but only the left input audio channel has sound input, sound is transmitted to the peer site, the right audio channel at the peer site plays sound, but the left audio channel at the peer site plays no sound. If the negotiation result is stereo, only the left input audio channel is enabled on the web interface of the endpoint, and only the left input audio channel has sound input, sound is transmitted to the peer site, and both the left and right audio channels at the peer site play sound.

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