From your description above, it seems that you want to access Lync Web Service external however you are getting internal Lync web service IP. Possible reason is /Autodiscover/AutodiscoverService.svc/root misconfig.
You must not get internal Lync web service IP when you access from external. I assume that you have following config, if not then match the same. 1. In the Lync topology you defined internal and external web services FQDNs. 2. external Lync web service pointed to vADC external VIP (reverse proxy) and forwarding to director pool / FE Pool. 3. Internal Lync Web service pointed to internal vADC VIP (reverse proxy) which is forwarding taffic to Director Pool. 4. Your simple URL and Lyncdiscover both resolve your external VIP. 5. make sure your port bridging rule forwarding (on VIP) 443 -> 4443 and 80 -> 8080.
Can you share VIP config and Lync client log to better understanding of issue.
Regards Balu Ilag
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