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SIP-over-TCP SRV DNS Lookup (agentshelf.syntexa.ch)
x402
SIP-over-TCP SRV DNS Lookup (agentshelf.syntexa.ch) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-19).
Resolves SRV records at _sip._tcp.{hostname} for SIP over TCP, given a registrable domain name
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs SRV records at _sip._tcp.{hostname} for SIP over TCP. The caller sends the registrable domain, not the underscored name. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/dns-srv-sip first.
Output
Returns the SRV record data for _sip._tcp.{hostname}, typically including priority, weight, port, and target hostname of the SIP server for TCP transport.
Example use cases
VoIP onboarding domain validation
“I'm setting up a SIP client and need to know the SIP TCP server host and port for the domain myvoipprovider.com — can you pull the SRV records for me?”
Telecom provider discovery
“Before routing calls through telecom.acme.org, I want to verify which SIP over TCP server it points to. Can you fetch the _sip._tcp SRV record for telecom.acme.org?”
SIP federation configuration
“We're trying to federate SIP calls with partner.example.net over TCP. What do the SRV records say about their SIP TCP endpoint?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-srv-sip?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to programmatically discover the SIP-over-TCP server location for a given domain via DNS SRV lookup, without having to run DNS tools locally. Prefer the free sandbox endpoint (/v1/sandbox/dns-srv-sip) first; fall back to this paid endpoint when the sandbox is unavailable or rate-limited.
Side effects
- Domain has no _sip._tcp SRV record — returns empty or NXDOMAIN result
- Invalid or malformed hostname input
- Network timeout resolving DNS
- Domain does not exist — NXDOMAIN
- Payment not received — x402 payment required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hostname | string | Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name. |
Tags
x402
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