{"uid":"cap_A4A9ep8iqsafvjfp-ReB-","slug":"sip-over-tcp-srv-dns-lookup-agentshelf-syntexa-ch-3d75a0a5","name":"SIP-over-TCP SRV DNS Lookup (agentshelf.syntexa.ch)","description":"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.","url":"https://agentshelf.syntexa.ch/v1/dns-srv-sip?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"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."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_h5OeyDTonUfjAbMPrOfZc","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Resolves SRV records at _sip._tcp.{hostname} for SIP over TCP, given a registrable domain name","exampleAgentPrompt":"Can you look up the SIP over TCP SRV records for the domain example.com so I can find the SIP server's host and port?","exampleUseCases":[{"title":"VoIP onboarding domain validation","prompt":"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?"},{"title":"Telecom provider discovery","prompt":"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?"},{"title":"SIP federation configuration","prompt":"We're trying to federate SIP calls with partner.example.net over TCP. What do the SRV records say about their SIP TCP endpoint?"}],"resultDescription":"Returns the SRV record data for _sip._tcp.{hostname}, typically including priority, weight, port, and target hostname of the SIP server for TCP transport.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T12:45:37.691Z","isFirstParty":false,"canonicalSlug":"sip-over-tcp-srv-dns-lookup-agentshelf-syntexa-ch-3d75a0a5"}