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SIP TCP SRV Record Lookup
x402
SIP 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 2026-10-22).
Looks up _sip._tcp SRV DNS records for a domain to discover SIP service host, port, priority, and weight via Cloudflare DoH.
Price / call$0.01
Success—
StatusUnknown
How this service works
SIP service discovery (_sip._tcp.<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 one or more SRV records for the _sip._tcp.<domain> DNS query, each containing: priority (integer), weight (integer), port (integer), and target hostname. Multiple records may be returned when the domain has multiple SIP endpoints for load balancing or failover.
Example use cases
VoIP provider SIP endpoint discovery
“I need to connect to the SIP service for voip-provider.com — can you find the SRV records for _sip._tcp on that domain and tell me the target host, port, priority, and weight?”
Telecom infrastructure audit
“I'm auditing SIP infrastructure for acmecorp.com — pull the _sip._tcp SRV records so I can see which host handles SIP, on what port, and whether priority and weight are configured correctly.”
Automated SIP failover routing
“Before setting up our SIP client, can you resolve the _sip._tcp SRV records for our carrier domain sip.carrier.net and return the full list of targets with their priorities and weights so we can configure failover?”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/srv/sip-tcp?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically discover where a domain's SIP TCP service lives, including host, port, priority, and weight, without manually guessing hostnames. It is ideal for VoIP client configuration, telecom infrastructure auditing, SIP trunk setup, and automated failover routing. It specifically targets _sip._tcp (TCP transport) as opposed to _sip._udp (UDP transport).
Side effects
- Domain has no _sip._tcp SRV records — returns empty result set
- Domain does not exist (NXDOMAIN) — lookup fails with DNS error
- Cloudflare DoH upstream timeout — transient error requiring retry
- Malformed domain input — query rejected
- SERVFAIL from authoritative DNS — upstream DNS error propagated
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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