Technical Specifications

SIP

Learn about SIP setup, IP ranges, ports, encryption, codecs, and DTMF support.

General SIP information

Call Logs & Response Codes

View and interpret call log response codes to troubleshoot call issues.

Call Logs Response Codes

Caller ID Formats

Learn about supported Caller ID formats (RAW, E.164, LOCAL) and how to customize them per trunk using CLI Prefix.

Caller ID Formats

Failover

Learn how DIDWW handles SIP failover and load balancing using DNS SRV and trunk groups for high availability.

Service Failover and Load Balancing

Fax Services

Set up fax over IP using T.38 or G.711 protocols.

FAX Services

STIR/SHAKEN

Learn about caller ID authentication and STIR/SHAKEN compliance.

STIR/SHAKEN

Toll-Free Dialing Format

View country-specific formats for dialing Toll-Free DIDs.

Inbound Toll-Free DID Dialing Format

UIFN Dialing Format

View country-specific dialing formats for Universal International Freephone Numbers.

Universal International Freephone Number (UIFN) Dialing Format

CPC Usage

Understand CPC values for toll-free calls and their role in call routing and billing.

CPC Usage