> ## Documentation Index > Fetch the complete documentation index at: https://docs.getsmartalex.com/llms.txt > Use this file to discover all available pages before exploring further. # Platform Capabilities > Full capability matrix. What SmartAlex telephony does, doesn't do, and will do. ## Feature matrix | Feature | Supported | Notes | | ----------------------------------------------- | --------------- | ------------------------------------- | | **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 | ## Known limits (today) | Limit | Value | | ----------------------------- | ---------------------------- | | Agent system prompt | 32,000 characters | | First message | 500 characters | | Extensions per trunk | 10,000 | | CSV import | 500 rows per batch | | Concurrent calls per trunk | 1,000 max | | API request rate | 60 requests/second/workspace | | Knowledge base document count | 1,000 per agent | | Knowledge base total size | 100 MB per agent | ## On the roadmap Not promised delivery dates. Organised by estimated priority. **Q2 2026:** * Attended (warm) transfer with 3-way bridge * Send DTMF from the AI (for IVR navigation on downstream systems) * Dedicated South African regional ingress **H2 2026:** * Live call monitoring for admins * Custom vocabulary for domain-specific transcription * Mutual TLS * IPv6 ingress **2027:** * SOC 2 Type II * ISO 27001 * On-premise deployment option for regulated industries ## What we intentionally don't do These are decisions, not gaps. * **We don't replace your PBX.** We integrate with it. If you want a PBX replacement, you want a different product. * **We don't offer a carrier service.** We partner with carriers; we don't terminate or originate calls on our own infrastructure. * **We don't sell DIDs in every country.** Available regions: US, UK, Australia, South Africa, Singapore. If you need a DID elsewhere, bring your own carrier. * **We don't do SMS autoresponders as a standalone product.** SMS send/receive is available via tools during a voice call. ## Next steps Limits, uptime targets, scaling. How it all fits together. Monitoring and reporting.