Interworking with IMS/NGN

Description: A mobile network can interwork with the NGN network directly through IP bearer. In this manner, unnecessary gateways in carrier networks do not need to be configured, thus saving investment on devices for carriers. Interworking with the NGN network can be implemented on a VMSC or a GMSC that supports codecs of fixed networks.

The UMG8900 supports G.711, G.723, and G.729 codecs of fixed networks for voice interworking with the NGN network.

The mobile MGW, which supports the NGN codecs (G.711, G.723, and G.729), can interwork directly with the NGN through the IP protocol, which reduces the codec conversion times, improves the voice quality, and reduces the investments of carriers in devices.

Huge benifits from the Operator point of view.

This feature requires the cooperation of the MSC server. IP-based interworking between the GSM/UMTS network and the NGN network requires the MGW in the mobile network to covert mobile network codecs (for example, AMR) to codecs (for example, G.711, G.729, and G.723) that are required by the fixed network. Therefore, this feature requires the cooperation of the G.711 μ -law and A-law, G.729 codec, or G.723 codec feature.

Upon dependency has to overcome....

G.711 is an ITU-T standard for audio companding. It is primarily used in telephony. The standard was released for usage in 1972. Its formal name is Pulse code modulation (PCM) of voice frequencies. It is a required standard in many technologies, for example in H.320 and H.323 specifications. It can also be used for fax communication over IP networks.

G.723 is an ITU-T standard speech codec using extensions of G.721 providing voice quality covering 300 Hz to 3400 Hz using Adaptive Differential Pulse Code Modulation (ADPCM) to 24 and 40 kbit/s for digital circuit multiplication equipment(DCME) applications. The standard G.723 is obsolete and has been superseded by G.726.

G.729 is an audio data compression algorithm for voice that compresses digital voice in packets of 10 milliseconds duration. It is officially described as Coding of speech at 8 kbit/s using code-excited linear prediction speech coding .Because of its low bandwidth requirements, G.729 is mostly used in Voice over Internet Protocol (VoIP) applications where bandwidth must be conserved, such as conference calls. Standard G.729 operates at a bit rate of 8 kbit/s, but there are extensions, which provide rates of 6.4 kbit/s and 11.8 kbit/s  for worse and better speech quality, respectively.