Voip module is not saving Name for SMS message when written in UTF-8

[david.strejc]

We have found this issue:

* when there is message written in UTF-8 sent via Twillio this code is used:

line 186 in application/Espo/Modules/Voip/Repositories/VoipMessage.php

$name = substr($entity->get('body'), 0, 20);

throws:

ERROR: (22007) SQLSTATE[22007]: Invalid datetime format: 1366 Incorrect string value: '\xC5...' for column `crm_wpdistro_cz`.`voip_message`.`name` at row 1; POST /VoipMessage; line: 72


when changed to:

$name = mb_substr($entity->get('body'), 0, 20);

it is working fine.