Hi
The link has been fixed - but for your reference here are also some additional links to SIP Trunking product and developer pages:
SIP Trunking Product Information: https://www.sinch.com/products/voice/sip-trunking/
SIP Trunking Developer Documentation:
https://developers.sinch.com/docs/voice/api-reference/sip-trunking/
InApp to SIP (Android, others have SIP as well)
https://developers.sinch.com/docs/in-app-calling/android/calling/#set-up-an-app-to-sip-call
SVAML connectSIP
https://developers.sinch.com/docs/voice/api-reference/svaml/actions/#connectsip
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