diff --git a/src/network/FNENetwork.cpp b/src/network/FNENetwork.cpp
index 74579b51..c6cd0f91 100644
--- a/src/network/FNENetwork.cpp
+++ b/src/network/FNENetwork.cpp
@@ -89,6 +89,7 @@ FNENetwork::FNENetwork(HostFNE* host, const std::string& address, uint16_t port,
     m_peers(),
     m_maintainenceTimer(1000U, pingTime),
     m_updateLookupTimer(1000U, (updateLookupTime * 60U)),
+    m_callInProgress(false),
     m_verbose(verbose)
 {
     assert(host != nullptr);
@@ -156,6 +157,11 @@ void FNENetwork::clock(uint32_t ms)
             m_peers.erase(peerId);
         }
 
+        // roll the RTP timestamp if no call is in progress
+        if (!m_callInProgress) {
+            frame::RTPHeader::resetStartTime();
+        }
+
         m_maintainenceTimer.start();
     }
 
diff --git a/src/network/FNENetwork.h b/src/network/FNENetwork.h
index 080db6b2..6dfd1cf3 100644
--- a/src/network/FNENetwork.h
+++ b/src/network/FNENetwork.h
@@ -237,6 +237,8 @@ namespace network
         Timer m_maintainenceTimer;
         Timer m_updateLookupTimer;
 
+        bool m_callInProgress;
+
         bool m_verbose;
 
         /// <summary>Helper to send the list of whitelisted RIDs to the specified peer.</summary>
diff --git a/src/network/Network.cpp b/src/network/Network.cpp
index 3e549e19..47cf1efb 100644
--- a/src/network/Network.cpp
+++ b/src/network/Network.cpp
@@ -248,6 +248,13 @@ void Network::clock(uint32_t ms)
         return;
     }
 
+    // roll the RTP timestamp if no call is in progress
+    if ((m_status == NET_STAT_RUNNING) &&
+        (m_rxDMRStreamId[0U] == 0U && m_rxDMRStreamId[1U] == 0U) &&
+        m_rxP25StreamId == 0U && m_rxNXDNStreamId == 0U) {
+        frame::RTPHeader::resetStartTime();
+    }
+
     sockaddr_storage address;
     uint32_t addrLen;
 
diff --git a/src/network/RTPHeader.cpp b/src/network/RTPHeader.cpp
index bc7fda86..a02aa03a 100644
--- a/src/network/RTPHeader.cpp
+++ b/src/network/RTPHeader.cpp
@@ -119,3 +119,11 @@ void RTPHeader::encode(uint8_t* data)
     __SET_UINT32(m_timestamp, data, 4U);                                        // Timestamp
     __SET_UINT32(m_ssrc, data, 8U);                                             // Synchronization Source Identifier
 }
+
+/// <summary>
+/// Helper to reset the start timestamp.
+/// </summary>
+void RTPHeader::resetStartTime()
+{
+    m_wcStart = hrc::hrc_t();
+}
diff --git a/src/network/RTPHeader.h b/src/network/RTPHeader.h
index ddf7c706..072ea14b 100644
--- a/src/network/RTPHeader.h
+++ b/src/network/RTPHeader.h
@@ -62,6 +62,9 @@ namespace network
             /// <summary>Encode a RTP header.</summary>
             virtual void encode(uint8_t* data);
 
+            /// <summary>Helper to reset the start timestamp.</summary>
+            static void resetStartTime();
+
         public:
             /// <summary>RTP Protocol Version.</summary>
             __READONLY_PROPERTY(uint8_t, version, Version);
diff --git a/src/network/fne/TagDMRData.cpp b/src/network/fne/TagDMRData.cpp
index eb02b045..8bfe3e49 100644
--- a/src/network/fne/TagDMRData.cpp
+++ b/src/network/fne/TagDMRData.cpp
@@ -156,6 +156,7 @@ bool TagDMRData::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
 
             LogMessage(LOG_NET, "DMR, Call End, peer = %u, srcId = %u, dstId = %u, duration = %u, streamId = %u",
                         peerId, srcId, dstId, duration / 1000, streamId);
+            m_network->m_callInProgress = false;
         }
 
         // is this a new call stream?
@@ -194,6 +195,7 @@ bool TagDMRData::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
                 status.streamId = streamId;
                 m_status[dstId] = status; // this *could* be an issue if a dstId appears on both slots somehow...
                 LogMessage(LOG_NET, "DMR, Call Start, peer = %u, srcId = %u, dstId = %u, streamId = %u", peerId, srcId, dstId, streamId);
+                m_network->m_callInProgress = true;
             }
         }
 
@@ -218,6 +220,9 @@ bool TagDMRData::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
                     LogDebug(LOG_NET, "DMR, srcPeer = %u, dstPeer = %u, seqNo = %u, srcId = %u, dstId = %u, flco = $%02X, slotNo = %u, len = %u, pktSeq = %u, stream = %u", 
                         peerId, peer.first, seqNo, srcId, dstId, flco, slotNo, len, pktSeq, streamId);
                 }
+
+                if (!m_network->m_callInProgress)
+                    m_network->m_callInProgress = true;
             }
         }
 
diff --git a/src/network/fne/TagNXDNData.cpp b/src/network/fne/TagNXDNData.cpp
index fabe861b..4fe24033 100644
--- a/src/network/fne/TagNXDNData.cpp
+++ b/src/network/fne/TagNXDNData.cpp
@@ -128,6 +128,7 @@ bool TagNXDNData::processFrame(const uint8_t* data, uint32_t len, uint32_t peerI
 
                 LogMessage(LOG_NET, "NXDN, Call End, peer = %u, srcId = %u, dstId = %u, duration = %u, streamId = %u",
                     peerId, srcId, dstId, duration / 1000, streamId);
+                m_network->m_callInProgress = false;
             }
 
             // is this a new call stream?
@@ -165,6 +166,7 @@ bool TagNXDNData::processFrame(const uint8_t* data, uint32_t len, uint32_t peerI
                     status.streamId = streamId;
                     m_status[dstId] = status;
                     LogMessage(LOG_NET, "NXDN, Call Start, peer = %u, srcId = %u, dstId = %u, streamId = %u", peerId, srcId, dstId, streamId);
+                    m_network->m_callInProgress = true;
                 }
             }
         }
@@ -190,6 +192,9 @@ bool TagNXDNData::processFrame(const uint8_t* data, uint32_t len, uint32_t peerI
                     LogDebug(LOG_NET, "NXDN, srcPeer = %u, dstPeer = %u, messageType = $%02X, srcId = %u, dstId = %u, len = %u, pktSeq = %u, streamId = %u", 
                         peerId, peer.first, messageType, srcId, dstId, len, pktSeq, streamId);
                 }
+
+                if (!m_network->m_callInProgress)
+                    m_network->m_callInProgress = true;
             }
         }
 
diff --git a/src/network/fne/TagP25Data.cpp b/src/network/fne/TagP25Data.cpp
index 28672b64..fecac383 100644
--- a/src/network/fne/TagP25Data.cpp
+++ b/src/network/fne/TagP25Data.cpp
@@ -170,6 +170,7 @@ bool TagP25Data::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
 
                 LogMessage(LOG_NET, "P25, Call End, peer = %u, srcId = %u, dstId = %u, duration = %u, streamId = %u",
                     peerId, srcId, dstId, duration / 1000, streamId);
+                m_network->m_callInProgress = false;
             }
 
             // is this a new call stream?
@@ -207,6 +208,7 @@ bool TagP25Data::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
                     status.streamId = streamId;
                     m_status[dstId] = status;
                     LogMessage(LOG_NET, "P25, Call Start, peer = %u, srcId = %u, dstId = %u, streamId = %u", peerId, srcId, dstId, streamId);
+                    m_network->m_callInProgress = true;
                 }
             }
         }
@@ -232,6 +234,9 @@ bool TagP25Data::processFrame(const uint8_t* data, uint32_t len, uint32_t peerId
                     LogDebug(LOG_NET, "P25, srcPeer = %u, dstPeer = %u, duid = $%02X, lco = $%02X, MFId = $%02X, srcId = %u, dstId = %u, len = %u, pktSeq = %u, streamId = %u", 
                         peerId, peer.first, duid, lco, MFId, srcId, dstId, len, pktSeq, streamId);
                 }
+
+                if (!m_network->m_callInProgress)
+                    m_network->m_callInProgress = true;
             }
         }