Caller ID names are limited to 15 total characters, including the first and last name. You can use multiple names with a space in between, so long as it remains under the character limit.
Alianza recommends that you limit special characters to “-” , “_”, “&” “,” (coma) and “.” (period). Other commonly used special characters such as “@”, “$”, “%”, etc., are allowed to be entered in the caller ID/Customer Name field; however, these characters may cause issues with device registration as the callerID name is part of the REGISTER/INVITE. If after using a special character you experience issues with device registration, we recommend removing the special character as the device may not allow it in the SIP header.