SIP_SECONDS
int sip_timer_TD = 32 * SIP_SECONDS;
#define SIP_MINUTES (60 * SIP_SECONDS)
#define SIP_TIMER_T1 (1 * SIP_SECONDS)
#define SIP_TIMER_T2 (4 * SIP_SECONDS)
#define SIP_TIMER_T4 (5 * SIP_SECONDS)