13000: Conference Noun cannot be mixed with Number nouns

This warning occurs when your <Dial> verb uses a <Conference> noun together with <Number> nouns, or when <Conference> is used more than once inside the same <Dial>. Use <Conference> to connect the current call to a named conference room. Use one or more <Number> nouns when you want <Dial> to call phone numbers.

• Your TwiML nests both <Conference> and <Number> inside the same <Dial> verb.
• Your TwiML includes more than one <Conference> noun inside a single <Dial> verb.
• Your application generates <Dial> dynamically and appends conference and number nouns to the same response.
• You used a simultaneous dialing pattern for <Number> nouns when you intended to place the caller into a conference.

• Update your TwiML so each <Dial> uses only one approach. Use a single <Conference> noun to join a conference room, or use one or more <Number> nouns to dial phone numbers.
• Remove any extra <Conference> noun so the <Dial> verb contains only one conference target.
• If you want to ring several phone numbers and connect the first answer, remove <Conference> and use multiple <Number> nouns inside <Dial>.
• If you want multiple participants in the same conversation, route each participant to the same named <Conference> instead of mixing <Conference> with <Number> nouns in one <Dial>.
• Inspect the final TwiML your application returns and confirm that each <Dial> contains only the noun type required for that call flow.

• TwiML Voice: <Dial>
• TwiML Voice: <Conference>
• TwiML Voice: <Number>