Building Enterprise Ready Telephony Systems with sipXecs 4.0: Leveraging open source VOIP for a rock-solid communications systemEbookBuilding Enterprise Ready Telephony Systems with sipXecs 4.0: Leveraging open source VOIP for a rock-solid communications systembyMichael W. PicherRating: 0 out of 5 stars0 ratingsSave Building Enterprise Ready Telephony Systems with sipXecs 4.0: Leveraging open source VOIP for a rock-solid communications system for later