A method of transmitting inband signaling messages in a mobile
telecommunications network using SACCH burst. In order to avoid
puncturing a fixed amount of bits out of every SACCH burst for inband
signaling, the 40-bit FIRE code of the SACCH is replaced with a shorter
CRC code, thereby creating unused bits for carrying the messages. After
the SACCH block is shortened, a plurality of dummy bits are inserted into
the shortened block prior to applying a 1/2 convolutional code to obtain
the coded block. The coded block is further interleaved, reordered and
mapped into 4 SACCH bursts. The dummy bits in each SACCH block are then
replaced by the inband signaling for transmission.