Poly卓上機での着信時の表示設定

hi @taka_zc 

How Caller ID Name Works in Japan (according to ChatGPT)

🔹 1. No Central CNAM Database

• Japan does not maintain a centralized CNAM (Caller Name) database like in the U.S.
• The phone number is displayed to the receiving party, but the name is not provided by the telecom network.
• Caller ID shows the phone number only, unless the receiving device matches it with a stored contact name.

🔹 2. Name Display Is Handled Locally by the Receiving Device

• Phones (especially mobile, desk phones, and smartphones) use their local address book or contact list to display a caller name.
• If the number is not saved locally, only the number is displayed (e.g., +81-3-1234-5678).
• The carrier does not send a name with the call signaling.

🔹 3. Corporate PBX/VoIP Systems

• Businesses using VoIP or PBX systems may insert a display name in the SIP From: or P-Asserted-Identity headers.
• However, this only works within compatible systems (e.g., SIP-to-SIP calls) and is not guaranteed across all carriers in Japan.

🔹 4. Mobile Carriers and CNAM

• Japanese mobile carriers do not offer a CNAM service.
• Some smartphones may attempt to identify unknown callers using third-party apps or spam-call databases, but this is not a network-provided feature.

📱 Summary: Caller Name Behavior in Japan

✅ What This Means for Poly Phones in Japan:

• To display names on incoming calls, the Poly E350 must rely on its local contact directory.
• If a contact is not stored, only the phone number will show.
• You may need to normalize numbers (e.g., from +81 to 0) so they match local contact entries, as previously discussed.

These are some zoom support articles and hp/poly documentation for poly e series desk phones.

Frequently asked questions about caller ID

Inbound call notifications (desk phones)

Supported desk phone features

Quick start guide for poly Edge-E series phones

Poly Edge E Series Phones User Guide PVOS 8.2.1

Poly Edge E Series Phones Administrator Guide PVOS 8.2.1

Poly Edge E Series Phones Parameter Reference Guide PVOS 8.2.1

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thanks,  eliot