Samsung S21 - VoWiFi Config & Ut XCAP info

 01.09.2021

 

• Install Allience Shield X, create account, enable Device Admin and Knox
• Search for : epdg
• Check the ePDG Connection Status : Connected ; Timeout/Idle, PeerDel/Idle, Disconnected
• CurrentRAT: IWLAN, LTE
  
• Setup VoWiFi parameters  (most likely all of  from epdg_apns_conf.xml , see https://volteromania.blogspot.com/p/samsung-voltevowifi-settings.html )
• Ut Interface : XCAP Connection Status, Info: https://realtimecommunication.wordpress.com/2015/05/27/ut-interface-what-is-it-for/
  

 

 

 

 

Ut Interface:

 

 

 

 

 

XCAP Server VDF RO: (See Samsung IMS Settings app): xcap.ims.mnc001.mcc226.pub.3gppnetwork.org

BFD Server VDF RO: (See Samsung IMS Settings app): bsf.mnc001.mcc226.pub.3gppnetwork.org

 

C:\nslookup xcap.ims.mnc001.mcc226.pub.3gppnetwork.org

Non-authoritative answer:
Name:    xcap.ims.mnc001.mcc226.pub.3gppnetwork.org
Addresses:  136.255.157.241
          136.255.170.225

 

C:\nslookup bsf.mnc001.mcc226.pub.3gppnetwork.org

Non-authoritative answer:
Name:    bsf.mnc001.mcc226.pub.3gppnetwork.org
Addresses:  136.255.170.226
          136.255.157.242 

 

Wireshark filter: (http and (ip.addr== 136.255.157.241 or ip.addr== 136.255.157.242 or ip.addr==136.255.170.226 or ip.addr==136.255.170.225)) or (dns contains mnc)

Messages used to get - HTTP GET -  the call forwarding info from the network and to setup a call forward to a specific number with HTTP PUT.

Call Forwarding: Unconditional: (rule deactivated).

Information coming in xml format from the network.