Nokia E51 also extends business value to end users and businesses through its ability to integrate tightly with corporate telephony systems (PBX) through Nokia Mobile Unified Communications solutions such as Nokia Intellisync Call Connect for Cisco and Nokia Intellisync Call Connect for Alcatel. These solutions deliver desk phone calling features - such as extension dialing, hold, transfer and conferencing - to a single, mobile device. Companies can also reduce their international call charges by routing the call over the corporate IP networks.