Supported MMS Content Types
Reference list of image, audio, video, text, and application MIME types supported for MMS messages sent through SIPSTACK.
Regulatory
Toll-Free SMS Support on SIPSTACK
SIPSTACK toll-free numbers can text within Canada and the US only after the number is verified. What verification needs, how long it takes, and what cannot be verified.
Caller ID Spoofing Explained
Understanding why someone may appear to be calling from your phone number, even though your system and our network are secure.
What is CASL?
CASL (Canada's Anti-Spam Legislation) is Canadian law governing commercial electronic messages including SMS, email, and instant messages sent within, to, or from Canada.
How to Log and Report Malicious Calls with Call Trace (*57)
How to use the Call Trace (*57) feature to log and report harassing, threatening, or malicious calls to SIPSTACK and law enforcement.
What is the Robocall Mitigation Database?
The FCC's Robocall Mitigation Database (RMDB) is a public registry where voice service providers certify their compliance with STIR/SHAKEN and robocall mitigation requirements.
What is the TRACED Act?
The TRACED Act gives the FCC and law enforcement expanded authority to prosecute phone scammers and mandates STIR/SHAKEN and robocall mitigation compliance for voice carriers.
The Telephone Consumer Protection Act (TCPA)
An overview of the TCPA — the US federal law governing robocalls, autodialed calls, and unsolicited text messages, and what it means for businesses.
What is Robocall Mitigation Compliance?
An overview of robocall mitigation programs (RMPs), STIR/SHAKEN, and the compliance obligations that apply to voice service providers under the TRACED Act.
What is STIR/SHAKEN?
STIR/SHAKEN is the North American call authentication framework that verifies caller identity to reduce illegal caller ID spoofing.
A2P 10DLC Campaign Use Case Types
Reference list of standard and special A2P 10DLC campaign use case types for US business SMS registration.
How to Register Your Business Under A2P 10DLC
Steps and information required to register a brand and campaign with The Campaign Registry for A2P 10DLC SMS compliance in the US.
How A2P 10DLC Trust Scores Affect Message Throughput
Explains how TCR Trust Scores determine SMS message throughput for A2P 10DLC campaigns in the US and what options are available if you want to appeal.
What is A2P 10DLC?
A2P 10DLC is the standard registration system for businesses sending application-to-person text messages using 10-digit long code numbers in the US.
Data Retention
Data retention periods for call logs, recordings, voicemails, and SMS/MMS messages by plan tier on the SIPSTACK platform.