okay, because a certain OEM's system does, idiotic things, lets handle a START_OF_STREAM block along side FULLRATE_VOICE blocks;

src/host/modem/ModemV24.cpp

@@ -1135,6 +1135,7 @@ void ModemV24::convertToAirTIA(const uint8_t *data, uint32_t length)
             StartOfStream start = StartOfStream();
             start.decode(dfsiData + dataOffs);
 
+            if (blockCnt == 1U) {
                 uint16_t nac = start.getNID() & 0xFFFU;
 
                 // bryanb: maybe compare the NACs?
@@ -1142,8 +1143,11 @@ void ModemV24::convertToAirTIA(const uint8_t *data, uint32_t length)
                 dataOffs += StartOfStream::LENGTH;
 
                 // ack start of stream
-            // bryanb: is this really the right place to be doing this...
                 ackStartOfStreamTIA(); 
+            } else {
+                dataOffs += 1U; // this is really bizarre and shouldn't be needed but Motorola has
+                                // forced my hand ... again
+            }
         }
         break;
         case BlockType::END_OF_STREAM: