Nortel 2033 Installation And Operation Manual

Also see for 2033: Installation and operation guide Fundamentals Fundamentals Installation and operation Quick reference card

Nortel 2033 Installation And Operation Manual Manual pdf 215 page image

Nortel IP Softphone 2050 Page 215 of 600IP Phones Description, Installation, and OperationAfter the customer enters this information, the IP Softphone 2050 contacts theNode Master, which selects a TPS with sufficient capacity to register theIP Softphone 2050. The IP Softphone 2050 contacts the chosen TPS and, ifthe IP Softphone 2050 is valid, registers it with the system. The registrationinformation is then saved to the IP Softphone 2050.Loss planThe USB Headset Adapter provides the IP Softphone 2050 with a fixed lossplan compliant with the TIA-810A specification. If other headsets or audiodevices are used, the loss plan is unknown and undefined. Nortel supports theresolution of audio problems only for the USB Headset Adapter.Echo cancellationEcho can be generated electrically when there is an impedance mismatch, orgenerated acoustically by feedback from a speaker or ear piece to amicrophone. Any echo that is ultimately returned to the IP Phone is morenoticeable to the listener because of the additional delay introduced by the IPconnection.The Voice Gateway Media Card has echo cancelers included as part of itsfunction that cancels echo generated on the TDM side of the Media Gateway.When audio goes through the Voice Gateway Media Card, the echocancellers are enabled.The IP Softphone 2050 has no echo canceller, so a slight echo from acousticcoupling on the headset can occur in some call situations.Clock synchronizationBuffer underruns and overruns can occur since there is no sample clock at thereceiving end of an IP audio stream synchronized to the transmitting clock.The buffer overruns and underruns are corrected by two mechanisms, both ofwhich apply to the IP Phones and the DSPs on the Voice Gateway MediaCard.