# SIPS TCP SRV Record Lookup

> SIPS TCP SRV Record Lookup is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-18).

Resolves _sips._tcp SRV DNS records for a domain via Cloudflare DoH, returning priority, weight, port, and target host for the domain's SIPS service.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/srv/sips-tcp
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sips-tcp-srv-record-lookup-bd4ef6f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_D4VlKEfPBEOnkOJ6aW_c7

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sips-tcp-srv-record-lookup-bd4ef6f9
```

Example prompt: Can you look up the _sips._tcp SRV record for example.com so I know which host and port to connect to for its secure SIP service?

## When to prefer this

Use this endpoint when you need to programmatically discover the correct host and port for a domain's SIPS (Secure SIP over TLS) service without hardcoding hostnames. Ideal for VoIP client configuration, telecom infrastructure automation, and DNS auditing tasks. Prefer this over manual DNS tools when you need a pay-per-use, no-setup DNS resolution step inside an agent workflow.

## Known failure modes

- Domain has no _sips._tcp SRV record — returns empty answer set
- Invalid or malformed domain name input — returns DNS error
- Domain does not exist (NXDOMAIN) — returns not found error
- Cloudflare DoH upstream timeout — returns service unavailable
- DNS lookup succeeds but record is misconfigured (e.g. target is '.')

## How this service works

SIPS service discovery (_sips._tcp.<domain>): SRV records with priority, weight, port and target host, from Cloudflare DoH. Tells a client where the domain's sips service lives without guessing hosts. $0.01 per lookup.

## Output

Returns SRV record data for _sips._tcp.<domain> including one or more records each containing: priority (integer), weight (integer), port (integer), and target hostname — allowing a client to rank and connect to the correct SIPS server endpoint.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sips-tcp-srv-record-lookup-bd4ef6f9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)