unable to subscribe with all extensions defined as "~"

When we send POST request to /subscription endpoint

with this payload:

{'eventFilters': ['/restapi/v1.0/account/~/extension/~/missed-calls',
  '/restapi/v1.0/account/~/extension/~/start-ring',
  '/restapi/v1.0/account/~/extension/~/stop-ring',
  '/restapi/v1.0/account/~/extension/~/incoming-call-pickup',
  '/restapi/v1.0/account/~/extension/~/voicemail',
  '/restapi/v1.0/account/~/extension/~/message-store'],
 'deliveryMode': {'transportType': 'WebHook',
  'address': 'https://1e............315',
  'verificationToken': '75...........2e986'},
 'expiresIn': 630720000}

the address is successfully registered

but it is then visible then like:

        {
            "uri": "https://platform.ringcentral.com/restapi/v1.0/subscription/626ea38.............0c561f",
            "id": "626ea384-4576-433b-b9b2-44af300c561f",
            "creationTime": "2020-08-04T14:53:59.642Z",
            "status": "Active",
            "eventFilters": [
                "/restapi/v1.0/account/2460114020/extension/2744114015/incoming-call-pickup",
                "/restapi/v1.0/account/2460114020/extension/2744114015/voicemail",
                "/restapi/v1.0/account/2460114020/extension/2744114015/message-store",
                "/restapi/v1.0/account/2460114020/extension/2744114015/start-ring",
                "/restapi/v1.0/account/2460114020/extension/2744114015/stop-ring",
                "/restapi/v1.0/account/2460114020/extension/2744114015/missed-calls"
            ],
            "expirationTime": "2036-06-08T15:47:19.642Z",
            "expiresIn": 499998021,
            "deliveryMode": {
                "transportType": "WebHook",
                "encryption": false,
                "address": "https://1............315"
            }
        }

why '~' was replaced with 2460...020 and 2744...015?

I wanted to register for a subscription of events about all phone numbers/extensions.