diff --git a/CMakeLists.txt b/CMakeLists.txt
index 25102cf3..d28fd2c6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,6 +26,7 @@ OPTION(SEMS_USE_TTS           "Build with Text-to-speech support (requires Flite
 OPTION(SEMS_USE_OPENSSL       "Build with OpenSSL" OFF)
 OPTION(SEMS_USE_MONITORING    "Build with monitoring support" OFF)
 OPTION(SEMS_USE_IPV6          "Build with IPv6 support" OFF)
+OPTION(MAX_RTP_SESSIONS:int "How many rtp sessions sSEMS will handle simultaneously? (default 2048)" 2048)
 
 SET(CMAKE_VERBOSE_MAKEFILE ON)
 
diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 89bd9b29..749609ae 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -55,6 +55,14 @@ INCLUDE_DIRECTORIES (amci)
 ADD_EXECUTABLE (sems ${sems_SRCS})
 TARGET_LINK_LIBRARIES(sems ${CMAKE_DL_LIBS} pthread stdc++ m)
 
+IF(CMAKE_COMPILER_IS_GNUCC)
+	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DMAX_RTP_SESSIONS=${MAX_RTP_SESSIONS}")
+ENDIF(CMAKE_COMPILER_IS_GNUCC)
+
+IF(CMAKE_COMPILER_IS_GNUCXX)
+	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DMAX_RTP_SESSIONS=${MAX_RTP_SESSIONS}")
+ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+
 IF(SPANDSP_FOUND)
 	IF(CMAKE_COMPILER_IS_GNUCC)
 		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DUSE_SPANDSP -D__STDC_LIMIT_MACROS")
@@ -76,7 +84,7 @@ IF(LIBSAMPLERATE_FOUND)
 	ENDIF(CMAKE_COMPILER_IS_GNUCXX)
 	TARGET_LINK_LIBRARIES(sems ${CMAKE_DL_LIBS} samplerate)
 ENDIF(LIBSAMPLERATE_FOUND)
-	
+
 IF(SEMS_USE_IPV6)
 	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DSUPPORT_IPV6")
 	SET(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS}   -DSUPPORT_IPV6")