| SIP ingress protocols | | |
| SIP over UDP | Yes | Default |
| SIP over TCP | Yes | |
| SIP over TLS | Yes | Port 5061, cert-chain note applies |
| IPv6 | Roadmap | IPv4 only today |
| Authentication | | |
| Digest auth | Yes | Default for most customers |
| IP allowlist | Yes | Requires static public IP |
| Combined (digest + IP) | Yes | Defence in depth |
| Mutual TLS | Roadmap | |
| Codecs | | |
| G.711 u-law (PCMU) | Yes | Default |
| G.711 A-law (PCMA) | Yes | Default |
| G.722 HD | Yes | When both sides negotiate it |
| G.729 | On request | Licensed, contact support |
| Opus | Yes | For WebRTC endpoints |
| DTMF | | |
| Receive DTMF (RFC 2833) | Yes | AI detects caller key presses |
| Send DTMF | Roadmap | For IVR navigation downstream |
| In-band DTMF | No | RFC 2833 only |
| Transfers | | |
| Cold (blind) transfer via REFER | Yes | |
| Warm transfer to named person | Yes | With briefing |
| Attended transfer | Roadmap | |
| Transfer to PBX extension | Yes | |
| Transfer to PBX queue or ring group | Yes | |
| Transfer to external PSTN number | Yes | |
| Transfer with caller ID forwarding | Yes | Via P-Asserted-Identity |
| Call handling | | |
| Inbound calls | Yes | |
| Outbound calls (agent-initiated) | Yes | For campaigns |
| Outbound calls (from PBX through us) | Yes | Less common use case |
| Voicemail drop | Yes | Custom message per agent |
| Voicemail detection | Yes | AI detects answering machines |
| Max call duration | 300 sec default | Configurable up to 14,400 sec |
| Silence timeout | 30 sec | AI re-engages or ends call |
| Concurrency | | |
| Per trunk limit | 10 default | Configurable to 1000 |
| Per workspace limit | Plan-based | |
| Global platform limit | Very high | Scales with infrastructure |
| Recording | | |
| Call recording | Yes | On by default |
| Recording retention | 90 days default | 7 to 365 days configurable |
| Per-call suppression | Yes | Agent-driven |
| Download recordings | Yes | Admin users |
| Live monitoring | Roadmap | |
| Transcription | | |
| Real-time transcript | Yes | |
| Post-call summary | Yes | AI-generated |
| Sentiment tagging | Yes | Per call |
| Custom vocabulary | Roadmap | |
| Multilingual transcripts | Partial | Based on agent voice config |
| Observability | | |
| Call logs | Yes | Dashboard and API |
| Call Detail Records export | Yes | CSV, API |
| Real-time webhooks | Yes | |
| Metrics dashboard | Yes | Per agent, per time range |
| SIEM integration | Enterprise plan | Syslog export |
| Quality metrics (MOS, jitter) | Roadmap | |
| Integration | | |
| REST API | Yes | Full CRUD on agents, calls, contacts |
| MCP server | Yes | Exposed at the docs domain |
| Webhooks | Yes | Configurable per agent |
| Custom tools | Yes | Via the tool registry |
| AI capabilities | | |
| Natural language understanding | Yes | |
| Context retention within call | Yes | |
| Knowledge base lookup | Yes | Per-agent KB |
| External tool calls (CRM, calendar, custom API) | Yes | |
| Google Search grounding | Yes | For current-facts questions |
| Custom voice character and accent | Yes | Per agent |
| Multilingual conversation | Partial | English primary, depends on voice |
| Resilience | | |
| Regional redundancy | Yes | Auto-routed to nearest healthy region |
| Graceful degradation on failures | Yes | AI speaks fallback, takes message |
| Automatic reconnect on transient failure | Yes | |
| Session survival across network blips | Limited | Best-effort RTP resume |
