This defines the starting value for a range of ports that will be used dynamically when sending out SIP RTP voice packets. This MIB and arrisMtaCfgRTPDynPortStart are to be used together. The range limit is 1024-65535. Where arrisMtaCfgRTPDynPortStart can be 1024 and arrisMtaCfgRTPDynPortEnd can be 65535. The default range is 49152-65535. However it should be noted that the IANA defines the following ranges: The Well Known Ports are those from 0 through 1023. The Registered Ports are those from 1024 through 49151. The Dynamic and/or Private Ports are those from 49152 through 65535.