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Yandex Telemost has been closed (UPD: ТЕЛЕМОСТ ЗАКРЫЛИ). The information on this page is preserved for reference only. The credential flow described here no longer works.

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Overview

When Telemost was active, you could obtain TURN credentials by passing a conference link to the client’s -yandex-link flag. Conference links had the form: 
https://telemost.yandex.ru/j/<id>
Unlike VK, Yandex TURN servers imposed no per-allocation speed cap. Because of this, the default for -n is 1 when using a Yandex link.
Increasing -n with a Yandex link joins the conference as multiple fake participants. This can cause a temporary IP ban due to conference flooding. Keep -n 1 unless you have a specific reason to increase it.
UDP mode (-udp) typically produced higher throughput with Yandex TURN servers than the default TCP mode.
Most Yandex TURN IP ranges did not work in practice. You had to specify a working server manually using -turn: 
./client-linux \
  -peer 203.0.113.10:56000 \
  -yandex-link "https://telemost.yandex.ru/j/AbCdEfGhIjKl" \
  -listen 127.0.0.1:9000 \
  -udp \
  -turn 5.255.211.241

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Known working TURN IPs

The following Yandex TURN IPs were confirmed to work: 
5.255.211.241
5.255.211.242
5.255.211.243
5.255.211.245
5.255.211.246
Pass any of these as -turn <ip>.

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How credential retrieval worked

1

REST call to cloud-api.yandex.ru

The client sent a GET request to cloud-api.yandex.ru with the conference link, retrieving a ConferenceResponse that included the media server WebSocket URL, room ID, peer ID, and session credentials.
2

WebSocket handshake to the media server

The client opened a WebSocket connection to the media_server_url from the conference response and sent a hello message identifying itself as a guest speaker ("Гость", role SPEAKER) with audio and video disabled.
3

Extract ICE server credentials from serverHello

The media server responded with a serverHello containing an rtcConfiguration.iceServers list. The client extracted the first UDP TURN entry (skipping TCP entries) to get the username, credential, and server address.

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