SIP
DNS, codecs, and the default voice
ITSP trunks, your SBC, gateways, bandwidth, NAT, and the ports that belong only to Studio.
SIP and carriers ยท practice ยท 12 min full read
The requirements prefer DNS SRV for the SIP targets. G.711 is the default codec, and the PDF describes it as uncompressed. Do not invent a packetization time. A 20 millisecond ptime shows up in practitioner notes about Cisco gateways. It is not a number this lab will attribute to the Five9 PDF.
- Prefer DNS SRV
- Keep G.711 as the default you can cite
RFC 3261 is the SIP signaling baseline. RFC 4733 is the telephone-event way digits often ride once the call is up. DTMF design is a separate sentence from the codec.
Keep practitioner numbers in their own column.
Split the ticket
Write the PDF facts and the practitioner note on two lines.
- SRV and G.711
- ptime as uncertain
- RFC 4733 if DTMF matters
A reader can see which line is official.
- DNS? SRV preferred.
- Default codec? G.711.
- 20 ms? Practitioner, uncertain, not a PDF quote here.
- Digit RFC? 4733.
- Technical requirements PDF. vendor. last checked 2026-10. Fetched for this lab in October 2026. Re-read before you buy hardware or open a firewall.
- SIP trunk options chapter. vendor. last checked 2026-10.
- RFC 3261. rfc. last checked 2026-10.
- RFC 4733. rfc. last checked 2026-10.
- RFC 3550, RTP. rfc. last checked 2026-10.
- RFC 3551, RTP profile for audio and video. rfc. last checked 2026-10.
- ITU-T G.711. standard. last checked 2026-10.
- RFC 1035, domain names. rfc. last checked 2026-10.
- RFC 2782, DNS SRV. rfc. last checked 2026-10.
- confirm. A 20 ms packet time is a practitioner note about Cisco gateways, not a figure quoted from the Five9 technical requirements in this lab. last checked 2026-10.
Glossary. Forecast: The WFM page's base for staffing: multiskill, multichannel, several algorithms it does not name. Workforce management
Sister technologies. Salesforce IVR module. A script module, including SFDC Einstein. Different from the desktop adapter. IVR modules
Config. Write the PDF facts and the practitioner note on two lines.
Troubleshooting. The PDF was never opened. Test G.711. Treat 20 ms as an unproven extra.
Cross-platform bridge. A mapping to another PBX or contact center is a teaching bridge. It is not an import button.
Future hook. The guide's cloud endpoint stays unset. Confirm before relying on a dated catalog or a case-study number.