One way audio in outbound calls with SCCP

How do you do!
I’am installed chan_SCCP on Asterisk (under FreePBX). I successfully connected Cisco IP Phones to Asterisk, I very good receive calls from inbound, but when I’am calling to another number, I get one way audio. I can hear, but they can’t.
My sccp.conf file:

[general]
servername = FreePbxSCCP
keepalive = 60
debug = 1
context = from-internal-xfer
dateformat = D.M.Y
bindaddr = 192.168.1.30
port = 2000
disallow=all
allow=alaw
allow=ulaw
firstdigittimeout = 16
digittimeout = 8
autoanswer_ring_time = 1
autoanswer_tone = 0x32
remotehangup_tone = 0x32
transfer_tone = 0
callwaiting_tone = 0x2d
musicclass=default
language=en
nat=off
deny=0.0.0.0/0.0.0.0
permit=internal                                     
permit=192.168.1.0/255.255.255.0
permit=0.0.0.0/0.0.0.0
dndFeature = on
sccp_tos = 0x68
sccp_cos = 4
audio_tos = 0xB8
audio_cos = 6
video_tos = 0x88
video_cos = 5
echocancel = on
silencesuppression = off
private = on
callanswerorder=oldestfirst
hotline_enabled=yes                                   
hotline_context=default                               
hotline_extension=111

[SEP58XXXXXXXD7]

description = none

devicetype = 7942

type = device

button = line, 128

deny=0.0.0.0/0.0.0.0

permit=0.0.0.0/0.0.0.0

pickupcontext = sccp

tzoffset = +0

transfer = on

trustphoneip = no

directrtp=off

earlyrtp = progress

private = on

mwilamp = on

mwioncall = off

setvar=testvar=value

cfwdall = on


[128]

id = 128

type = line

label = Phone 128

description = Line 128

cid_name = 128

cid_num = 128

echocancel = off

context = from-internal-xfer

incominglimit = 3

transfer = on

vmnum = 600

trnsfvm = 1000

secondary_dialtone_digits = 9

secondary_dialtone_tone = 0x22

musicclass=default

language=en

echocancel = on

silencesuppression = off

nat=on

Thanks for reply,
It’s not working. But I change it.

This might not be a NAT problem on the SCCP side. Check your NAT settings for your SIP connections to your ITSP. You might have a one-way audio problem with anything on the outside from the inside.

One-way audio is always a NAT problem on these phones. If you have everything set up correctly for the SCCP phones to connect, the NAT issue must be somewhere else. Be sure to check your Advanced SIP Settings for your ITSP and make sure the SIP traffic is getting routed correctly.

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