VoWiFi in Roaming info

VoWiFi in Roaming. Different ways to block the VoWiFi in Roaming and how to overtake them


VoWiFi technical details


Imagini pentru voWiFi architecture













 
1st read: https://volteromania.blogspot.com/p/blog-page_25.html

1. Best option when roaming in non SEE countries: Digi Romania doesnt block VoWifi in Roaming. Optim 2 rupe tot in Roaming !

2. Block the VoWiFi based on the type of the IP: national vs foreign. ACLs are put in the firewalls between ePDG and Internet. Juniper/Cisco have geolocation paid services for their firewalls , updating the ACLs autometically with national IPs. ORO was using this in the past.
Solutions:
   A. Hotspot from another UE using a home operator SIM
   B. VPN From the WiFi router towards the home country

3. Block the VoWiFi from ePDG based on the type of IP
Solutions: same like above

4. Block the VoWiFi using DNS zone feature. The DNS used by the operator resolves the ePDG FQDN only if the requests come from national clients.
Solutions:
   A. root your phone, edit the host file (VDF Germany case)
   B. edit the DNSes (?)

5.Block VoWiFi based on the foreign SGSN/MME info.  If home HLR/HSS gets the information that the user is roaming, it denies access to VoWiFi.
Solution: put your phone in flight mode before leaving your country, when roaming enable WiFi ONLY

6. Block the DNS by the Mobile Phone vendor based on the registered network and other variables.
Possible Solution: root your phone :)

Example from Samsung (VoWiFi blocking in Samsung not used yet):

<vowifisettings>
        <!-- wifi_call_enable 0 = off, 1 = on -->
        <!-- wifi_call_preferred 1 = wifi pref, 2 = cs pref, 3 = wifi only, 4 = cs only -->
        <!-- wifi_call_when_roaming -1 = not used, 0 = cs pref, 1 = wifi pref -->
        <!-- wifi_call_vcc 2 = not used, 0 = disable, 1 = enable -->



        <!-- ORANGE Romania ORO/ROM -->
        <vowifi operatornumeric="22610"
            wifi_call_enable="0"
            wifi_call_preferred="1"
            wifi_call_when_roaming="-1"
            wifi_call_vcc="2"
        />

 

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