Call going but not audible with asterisk + flowroute

I have configured asterisk with flowroute. The registration is successful and outbound call connects but i am unable to hear any sound. The error i see in logs is

Failed to get 160 samples from write factory 0x7fd93000c2c8
[2017-04-13 12:10:20.605] DEBUG[19683][C-00000000]: audiohook.c:263 audiohook_read_frame_both: Read factory 0x7fd93000b688 and write factory 0x7fd93000c2c8 both fail to provide 160 samples
[2017-04-13 12:10:20.625] DEBUG[19683][C-00000000]: audiohook.c:316 audiohook_read_frame_both: Failed to get 160 samples from write factory 0x7fd93000c2c8
[2017-04-13 12:10:20.625] DEBUG[19683][C-00000000]: audiohook.c:263 audiohook_read_frame_both: Read factory 0x7fd93000b688 and write factory 0x7fd93000c2c8 both fail to provide 160 samples
[2017-04-13 12:10:20.645] DEBUG[19683][C-00000000]: audiohook.c:316 audiohook_read_frame_both: Failed to get 160 samples from write factory 0x7fd93000c2c8

My configurations are as follow

sip.conf

[general]
register => username:password@sip.flowroute.com
allow=ulaw

sip-custom-contexts.conf

[flowroute]                     ; keep this lowercase, do not change format
type=friend
secret=username
username=password
host=sip.flowroute.com
type=peer
transport=udp
port=5060
dtmfmode=rfc2833
context=to-pstn                ; change to 'ext-did' or 'from-trunk' for asterisk@home
canreinvite=no
allow=ulaw
;allow=g729                     ;uncomment this line if you have G.729 licenses installed.
insecure=port,invite
fromdomain=sip.flowroute.com
keepalive=yes
qualify=no
progressinband=yes

rtp.conf

[general]
rtpstart=10000
rtpend=2000

Kindly help in this regard

Those are debug messages, not errors.

I would suggest providing more details about your network layout. Are you behind NAT for example, do you have a firewall. As well you would need to provide a SIP log (using sip set debug on) of a call attempt and the output of “rtp set debug on” to show if media is flowing.