# AgentShelf DNS SRV H.323 Lookup

> AgentShelf DNS SRV H.323 Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-19).

Looks up SRV records at _h323._tcp.{hostname} for H.323 VoIP service discovery, given a registrable domain name

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/dns-srv-h323?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-dns-srv-h-323-lookup-cb670809
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lJ6zFnvhRe0TNPyZfwLEV

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 agentshelf-dns-srv-h-323-lookup-cb670809 -d '<json body>'
```

Example prompt: Look up the H.323 SRV DNS records for example.com so I can find the H.323 gatekeeper endpoint and port.

## When to prefer this

Use this endpoint when an agent needs to discover H.323 VoIP/video conferencing endpoints via DNS SRV records for a given domain. It handles the _h323._tcp prefix internally so callers only need to supply the plain registrable domain. Prefer the free sandbox endpoint /v1/sandbox/dns-srv-h323 first; use this paid endpoint when the sandbox is unavailable or rate-limited.

## Known failure modes

- Domain does not have _h323._tcp SRV records — returns empty or NXDOMAIN response
- Invalid or malformed hostname input — request rejected
- Hostname exceeds 253 characters — validation error
- DNS resolution timeout or upstream resolver failure
- Private or reserved domain names may not resolve

## How this service works

Call when an agent needs SRV records at _h323._tcp.{hostname} for H.323. The caller sends the registrable domain, not the underscored name. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-h323 first.

## Output

Returns the SRV record set found at _h323._tcp.{hostname}, including priority, weight, port, and target hostname for each record, enabling H.323 service discovery.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hostname": {
   "type": "string",
   "examples": [
    "example.com"
   ],
   "maxLength": 253,
   "minLength": 1,
   "description": "Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-dns-srv-h-323-lookup-cb670809/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)