Thank you sir for attending our problem.
Upon running a debug, we monitored that we are not getting any TX Answer signal. Also when we show call active voice the output looks like this:
22A4 : 5565690hs.1 +-1 pid:0 Answer connected
dur 00:00:00 tx:137/4393 rx:0/0
IP xxx.xxx.xx.xxx:49654 rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms gsmfr
22A4 : 5565691hs.1 +-1 pid:122 Originate 22011639174123045 connecting
dur 00:00:00 tx:0/0 rx:137/4393
Tele 1/2:1 (110) [1/2.0] tx:12800/2000/0ms gsmfr noise:-63 acom:127 i/0:-52/-
7 dBm
Telephony call-legs: 1
SIP call-legs: 0
H323 call-legs: 1
MGCP call-legs: 0
Multicast call-legs: 0
Total call-legs: 2
You will notice that the ouput codec is gsmfr, but we set this as g729r8.