NethVoice CTI: Voicemail drawer becomes very slow with large message lists (missing infinite scroll)

[mgarra]

Description

In NethVoice CTI, the right-side drawer for Voicemail becomes extremely slow when the mailbox contains a high number of messages (reported: >2600). The whole CTI UI noticeably lags, likely because the drawer loads/render all messages at once (no infinite scrolling / virtualization).
In contrast, History → Voicemail (paged list) works fine.

Steps to reproduce

1. Open NethVoice CTI web UI.
2. Ensure the user has a voicemail mailbox with a large number of messages (e.g., ~2600+).
3. Open the Voicemail right-side drawer.
4. Scroll and interact with the CTI UI (e.g., switch sections, open/close drawer).

Expected behavior

The Voicemail drawer remains responsive and does not degrade overall CTI performance, even with thousands of messages (e.g., by using infinite scrolling / pagination / list virtualization).

Actual behavior

Opening and using the Voicemail drawer with thousands of messages causes severe UI slowdown and impacts the whole CTI experience.

See also

• [Support ticket (private)](https://helpdesk.nethesis.it/a/tickets/202680)
• [Mattermost thread (private)](https://mattermost.nethesis.it/nethesis/pl/rr9au5nt6tn38k47byax1qnwiw)
• [nethesis/nethvoice-cti](https://github.com/nethesis/nethvoice-cti)