# SIP UDP SRV Record Lookup via Cloudflare DoH

> SIP UDP SRV Record Lookup via Cloudflare DoH is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Looks up _sip._udp SRV DNS records for a domain using Cloudflare DNS over HTTPS, returning priority, weight, port, and target host for the domain's SIP service.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/srv/sip-udp?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sip-udp-srv-record-lookup-via-cloudflare-doh-fabbc830
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ATqtlqzmiCfXCe49ERIks

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 sip-udp-srv-record-lookup-via-cloudflare-doh-fabbc830
```

Example prompt: Can you look up the _sip._udp SRV DNS records for example.com and tell me the target host, port, priority, and weight so I know where its SIP service is pointing?

## When to prefer this

Use this endpoint when you need to programmatically discover where a domain's SIP (Session Initiation Protocol) service is hosted, specifically via the _sip._udp SRV record. Prefer it over generic DNS lookups when you need SIP-specific service discovery with priority and weight metadata for load balancing or failover logic. It is ideal for VoIP provisioning, SIP federation setup, or network auditing workflows.

## Known failure modes

- Domain has no _sip._udp SRV records (NXDOMAIN or empty answer section)
- Domain does not exist (NXDOMAIN)
- Cloudflare DoH is temporarily unavailable
- Malformed or missing domain input parameter
- DNS resolution timeout

## How this service works

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

## Output

Returns the _sip._udp SRV DNS records for the queried domain as resolved by Cloudflare DoH, including one or more records each containing priority, weight, port number, and target hostname, along with the TTL and DNS response code.

## 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/sip-udp-srv-record-lookup-via-cloudflare-doh-fabbc830/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)