What is sinch-elastic-sip-trunking?

A tool for setting up Sinch Elastic SIP Trunking, which connects business phone systems to the public telephone network using SIP. It can configure trunks, access rules or credentials, endpoints, and phone numbers.

Use it to provision inbound or outbound voice connectivity, configure fixed or registered endpoints, authorize traffic, and connect a business phone system to the PSTN.

It guides the network and authentication choices needed to route incoming or outgoing calls between a PBX or other SIP system and telephone numbers.

sinch-elastic-sip-trunking — Skill for Claude Code and Codex by sinch

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add sinch/sinch-plugins --skill elastic-sip-trunking

Clone the repo

git clone --depth 1 https://github.com/sinch/sinch-plugins

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sinch/sinch-plugins/elastic-sip-trunking.svg)](https://agentmods.dev/skills/sinch/sinch-plugins/elastic-sip-trunking)

Your own site

<a href="https://agentmods.dev/skills/sinch/sinch-plugins/elastic-sip-trunking"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/elastic-sip-trunking.svg" alt="Measured on agentmods" height="20"></a>

Per session 69 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,653 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin 100% copy Near-identical to another mod in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00069	$0.03653
Opus 5	$0.00034	$0.01826
Sonnet 5	$0.00014	$0.00731
Haiku 4.5	$0.00007	$0.00365

Measured 7d ago against content hash c0d6994a70d3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

sinch-elastic-sip-trunking scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

4. **Approach** — SDK or direct API calls (curl/fetch/requests)?

Origin

This is a copy

100% identical to sinch-elastic-sip-trunking — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugins/sinch-antigravity-plugin/skills/elastic-sip-trunking/SKILL.md · 225 lines

How it starts

The opening of the file, as written. The whole thing — 225 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sinch Elastic SIP Trunking API

Overview

The Sinch Elastic SIP Trunking (EST) API lets you programmatically provision SIP trunks and route voice traffic between customer infrastructure and the PSTN. The core workflow is: create a trunk, authorize it (ACL or credentials), attach endpoints, assign phone numbers.

Agent Instructions

Before generating code, gather from the user (skip any item already specified in the prompt or context):

Direction — inbound (receive calls from PSTN), outbound (send calls to PSTN), or both?
Auth method for the trunk (if outbound or both) — ACL-based (static IPs) or Credential-based (digest auth / dynamic IPs)?
Endpoint type (if inbound or both) — Static endpoint (fixed IP/port) or Registered endpoint (SIP UA registers dynamically)?
Approach — SDK or direct API calls (curl/fetch/requests)?
Language — for SDK: Node.js. For direct API: any language, or curl. Python, Java, and .NET must use direct HTTP — only Node.js has SDK support.

When the user chooses SDK, refer to the sinch-sdks skill for installation and client initialization, then to the API references linked in References.

When the user chooses direct API calls, refer to the API references linked in References for request/response schemas.

Security: See the Security section below for url fetching policy and credential handling.

Decision Tree

User wants EST →
├─ Outbound only
│  ├─ Static IPs   → Workflow A (Trunk + ACL)
│  └─ Dynamic IPs  → Workflow E (Trunk + Credential List / Digest Auth)
├─ Inbound only
│  ├─ Static IP    → Workflow B (Trunk + Static Endpoint + Phone Number)
│  └─ Dynamic IP   → Workflow D (Trunk + Credential List + Registered Endpoint + Phone Number)
└─ Both           → Workflow C (Trunk + ACL/Creds + Endpoint + Phone Number)

Critical Rules

Dependency order matters. Creating resources out of order causes failures. Create Trunk → Create ACL/Credentials → Link to Trunk → Assign Phone Numbers → Create Endpoint
The Domain Trap. Never send SIP INVITEs to trunk.pstn.sinch.com. ALWAYS use {your-hostname}.pstn.sinch.com.
60-second propagation. After linking ACLs or Credentials, wait 60 seconds before testing.
Lower priority = higher preference. Endpoint priority: 1 is primary; priority: 100 is failover.
PUT replaces the entire object. Omitted fields become null.

Read the full file on GitHub · 225 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/diagnostics.md 3.3 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

7d ago First seen · 225 lines · 69 tokens per session scan A c0d6994a70d3

Subscribe to this mod's changes

sinch-elastic-sip-trunking is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 25d ago), licensed Apache-2.0. It adds 69 tokens to every session and 3,653 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to sinch-elastic-sip-trunking, differing in 0 lines, and is treated as a copy.

Backend and APIs Claude Code ai cli gemini gemini-extension sms

sinch-elastic-sip-trunking