my.py

from ldap3 import Server, Connection, ALL
# OU которые в которых не нужно искать, регистрозависимые
trash = ['system',
         'Computers',
         'Временное',
         'KMKR',
         'turned_off']
ous = []


server = Server('172.16.0.3', get_info=ALL)
conn = Connection(
    server,
    user='ползователь@KMKR.LOCAL',
    password='пароль',
    auto_bind=True
)

conn.search('OU=KMKR,DC=kmkr,DC=local',
            search_filter='(ObjectClass=organizationalunit)',
            attributes=['ou'])

for entry in conn.entries:
    if entry.ou.value not in trash:
        ous.append(entry.ou.value)

for ou in ous:

    unit = ou.split(' ')[0]

    with open(f'/var/www/html/book/{unit}.xml', 'w', encoding='utf-8') as file:
        file.write('<KMKRIPPhoneDirectory>\n')

        conn.search(f'OU={ou},OU=KMKR,DC=kmkr,DC=local',
                    search_filter='(ObjectClass=person)',
                    attributes=['cn', 'ipPhone'])

        for user in conn.entries:
            if user.ipPhone.value is not None:
                file.write(f'\t<DirectoryEntry>\n\t\t<Name>{user.cn.value}</Name>\n\t\t<Telephone>{user.ipPhone.value}</Telephone>\n\t</DirectoryEntry>\n')
        file.write('</KMKRIPPhoneDirectory>')

conn.unbind()