General

• Origin-Based Pricing
• Does Plivo support E.164 format calling?
• Does Zentrunk support SIP over TLS?
• What SIP request methods does Zentrunk SIP trunking support?
• What methods of authentication does Zentrunk SIP trunks support?
• What is the calls per second (CPS) limitation for Zentrunk SIP trunking?

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Configuration and Integration

• What IP addresses do I need to whitelist on my communications infrastructure for Zentrunk SIP trunking?

Country-specific restrictions/issues

• What are the restrictions on outbound calling toward Australia?
• What are the restrictions on calling toward China?
• What are the restrictions on caller ID?