Audio & Network
- Stable bandwidth, low latency, QoS where possible
- Target values: One-way latency ≤ 150 ms for good call quality
- Source: ITU‑T G.114 – One-way Transmission Time
Assistant Tuning
- Choose a voice suited to the use case (clear vs. natural)
- Adjust interruption threshold based on the target audience
- Use filler audios to reduce response time
IVR & DTMF
- Test the DTMF tool (key sequences, timing)
- Follow RTP-DTMF according to RFC 4733 (Out-of-Band)
- Source: RFC 4733 – RTP Payload for DTMF Digits
Troubleshooting see: /troubleshooting/call-quality · /automation-platform/calls-related/sms-capabilities
Brief Study: Voice Quality & IVR
- Data basis: ITU-T recommendations (G.114), IETF/RFC 4733
- Key points:
- Speech intelligibility decreases measurably beyond 150 ms one-way latency
- Out-of-band DTMF is preferred over in-band for IVR reliability
- Limitations: Real networks vary (jitter/loss); monitoring required
References
- ITU-T G.114: https://www.itu.int/rec/T-REC-G.114
- RFC 4733: https://www.rfc-editor.org/rfc/rfc4733