try this
Code:
DEFINE OSC 20
 INCLUDE "MODEDEFS.BAS"

 #config
        __CONFIG    _CONFIG1H, _OSC_HS_1H
        __CONFIG    _CONFIG2L, _PWRT_OFF_2L & _BOREN_OFF_2L & _BORV_2_2L
        __CONFIG    _CONFIG2H, _WDT_OFF_2H & _WDTPS_16384_2H
        __CONFIG    _CONFIG3H, _PBADEN_OFF_3H & _MCLRE_OFF_3H
        __CONFIG    _CONFIG4L, _LVP_OFF_4L & _XINST_OFF_4L
        __CONFIG    _CONFIG5L, _CP0_ON_5L & _CP1_ON_5L & _CP2_ON_5L
        __CONFIG    _CONFIG5H, _CPB_ON_5H
 #endconfig

    T2  var     byte

    LedG        VAR PORTA.1     ' Green LED     
    LedR        VAR PORTA.2     ' Red LED
    BUZ         VAR PORTA.3     ' Buzzer OP
    KeyLine     VAR PORTA.5     '  keyline
    BPear1      var PORTB.4     ' Push 1 IP
    BPear2      var PORTB.5     ' Push 2 IP
    Bcall     	var PORTB.6     ' Call Button
    Bcancel  	var PORTB.7     ' Cancel Button

    LedR = 0                    ' led off
    LedG = 0                    ' led off


 Start:
    BUZ = 1                     ' Buzzer off
    KeyLine = 1                 ' transmitter off

 '
 ''''''''''''''''''''''''''''''''''''''''''''''''''  ''''''''''''''''''''''''''''''
 Slp:       ' Now prepare for sleep
 ''''''''''''''''''''''''''''''''''''''''''''''''''  ''''''''''''''''''''''''''''''
 
 INTCON2.7 = 0           ' Enable weak pull-ups
    PORTA=%00001000         ' 
    PORTB=%11110000         '  
    PORTC=%00001000         ' 
    TRISA = %00000000       '
    TRISB = %11110000       '   
    TRISC = %00000000   
    T2=PORTB                ' Read port to ensure no setting of flag
    INTCON=%00001000        ' Enable the global interrupt and enable the change on port b

@ sleep  
@ nop 


PAUSE 100               ' Sound buzzer and Led as indicator of sleep exit
    ledr=1
    BUZ=0
    pause 100
    ledr=0
    BUZ=1
    pause 500
 goto slp

 end