For more information on all-IP network deployment applications, please see

See IEEE Spectrum's Fantastic 4G for the latest evolution status of 4G wireless networks.  For an update on VoLTE, see VoLTE Update.

SIPsocial creates a SIP 4G VoIP solution for the following 4G VoIP deployment issues:
  • Voice over LTE  (VoLTE) is not available by all 4G carriers. Meanwhile their wireless voice of a 4G phone is transmitted over pre-4G networks.
  • Incompatible 4G wireless protocols, WiMAX and LTE.
  • And when the networks use the same protocol as in the case of two LTE networks, they can't inter- operate if they use different wireless frequencies.
The SIPsocial may be able to provide solutions to the above 4G VoIP issues, illustrated and explained below, with the following results:
  • SIP 4G VoIP solution integrates VoIP services of and provides inter-carrier interfaces for the 4G networks (WiMAX and LTE).
  • SIP 4G VoIP enables converged 4G wireless services that supports both Internet data services and VoIP services. 
  • SIP 4G VoIP network does not depend on other pre-4G wireless networks to carry voice. 
  • SIP 4G VoIP phone does not need pre-4G interfaces, improves battery performance and costs less.
  • SIP 4G VoIP off-net call handoff between 4G carriers uses the Internet.

Incompatible 4G Protocols

Incompatible 4G Protocols

The 4G wireless networks can be either WiMAX or LTE. Their network protocols are not compatible, their  devices don't inter-operate. However, the incompatible 4G networks shown in the above diagram will allow SIP 4G phones, the red WiMAX phone and the green LTE phone, to communicate over the Internet if they are SIP enabled. 

Once SIP is enabled, SIP phones can make SIP calls if they know their IP addresses and if the addresses are not private.  The IP addresses are private when the SIP phones are behind  NAT devices as shown in the drawing.  If the NAT functions are turned off, the wireless network can assign public IP addresses to the phones.  SIPsocial can work with public or private IP addresses.  It provides the following services:
More on SIPsocial capabilities, see ICI Technology

Different Wireless Frequencies

Both wireless networks shown in the above drawing could be using LTE wireless protocol.  But if they operate with different frequencies and although they are all LTE, the phone of one network won't work with the other network because of the frequency mismatch.

SIPsocial enables the incompatible phones to communicate using the common IP layer in the SIP 4G phones and the 4G IP networks. Otherwise, they have to interface via the common TDM networks. SIPsocial will help the SIP 4G VoIP carriers by removing their dependency on the legacy TDM networks. This will optimize the carriers' operational expenses, improve voice quality of services and remove network delay caused by the multiple handoffs between networks.

Note that all IP solution is important because TDM or Time Division Multiplexing depends on manual procedures of provisioning and capacity planning to scale. In contrast, VoIP depends on IP routing algorithm software and statistical multiplexing gain to improve link utilization and scalability.