Central FREE PBX Falla de audio en llamadas

Hola amigos acudo a ustedes despues de varios intentos y busquedas en google no logro solucionar mi problema, tengo una central asterisk + freepbx, tengo una troncal Sip de con 50 extensiones, el problema es cuando alguien interno llama hacia la PSTN nosotros escuchamos bien pero nos escuchan muy bajo algunas llamadas.el error solo provienen de ciertas extensiones y no da todas., cuando son llamadas internas entre extensiones se escucha perfecto, los codec utilizados son g729,

type=friend
trustrpid=no
sendrpid=yes
qualify=yes
insecure=invite
dtmfmode=rfc2833
disallow=all
context=from-pstn
canreinvite=no
allow=g729

por otro lado al sacar una llamada y monitoriar el sip debug me devuelve lo siguiente

[2017-05-16 09:54:44] DEBUG[6275]: manager.c:5685 match_filter: Examining AMI event:
Event: RTCPSent
Privilege: reporting,all
Channel: SIP/500-00000656
ChannelState: 6
ChannelStateDesc: Up
CallerIDNum: 4039
CallerIDName: Carina Nicolai
ConnectedLineNum: 4034
ConnectedLineName: San Isidro Recepcion
Language: en
AccountCode:
Context: macro-dial-one
Exten: s
Priority: 48
Uniqueid: 1494939176.1866
Linkedid: 1494939176.1866
To: 179.41.31.210:5061
From: [::1]:0
SSRC: 0x4a7acf8a
PT: 200(SR)
ReportCount: 1
SentNTP: 1494939284.3616657408
SentRTP: 331787312
SentPackets: 4751
SentOctets: 95020
Report0SourceSSRC: 0x01d500a8
Report0FractionLost: 0
Report0CumulativeLost: 0
Report0HighestSequence: 4728
Report0SequenceNumberCycles: 1
Report0IAJitter: 3
Report0LSR: 0
Report0DLSR: 0.0000

[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:44] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:8765 __sip_alloc: Allocating new SIP dialog for [email protected][::1]:5060 - OPTIONS (No RTP)
[2017-05-16 09:54:45] DEBUG[5811]: acl.c:946 ast_ouraddrfor: For destination ‘190.192.26.172’, our source address is ‘190.111.211.57’.
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:3866 ast_sip_ouraddrfor: Setting AST_TRANSPORT_UDP with address 190.111.211.57:5060
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:8550 change_callid_pvt: SIP call-id changed from ‘[email protected][::1]:5060’ to ‘[email protected]:5060’
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:3352 initialize_initreq: Initializing initreq for method OPTIONS - callid [email protected]:5060
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:3709 __sip_xmit: Trying to put ‘OPTIONS sip’ onto UDP socket destined for 190.192.26.172:61003
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:4406 __sip_ack: Stopping retransmission on ‘[email protected]:5060’ of Request 102: Match Found
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:6707 sip_destroy: Destroying SIP dialog [email protected]:5060
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:8765 __sip_alloc: Allocating new SIP dialog for [email protected][::1]:5060 - OPTIONS (No RTP)
[2017-05-16 09:54:45] DEBUG[5811]: acl.c:946 ast_ouraddrfor: For destination ‘190.192.26.172’, our source address is ‘190.111.211.57’.
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:3866 ast_sip_ouraddrfor: Setting AST_TRANSPORT_UDP with address 190.111.211.57:5060
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:8550 change_callid_pvt: SIP call-id changed from ‘[email protected][::1]:5060’ to ‘[email protected]:5060’
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:3352 initialize_initreq: Initializing initreq for method OPTIONS - callid [email protected]:5060
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:3709 __sip_xmit: Trying to put ‘OPTIONS sip’ onto UDP socket destined for 190.192.26.172:61622
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:4406 __sip_ack: Stopping retransmission on ‘[email protected]:5060’ of Request 102: Match Found
[2017-05-16 09:54:45] DEBUG[5811]: chan_sip.c:6707 sip_destroy: Destroying SIP dialog [email protected]:5060
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.
[2017-05-16 09:54:45] DEBUG[27767][C-000004fc]: audiohook.c:277 audiohook_read_frame_both: Write factory 0x17fa608 was pretty quick last time, waiting for them.

gracias

Hola Manuel, que usas para conectar al lado PSTN? FIjate por lo general las placas FXO suelen tener el volumen de input y output donde podes darle +n o -n, segun entiendo deberias darle +X al output audio, es cuestion de ir probando, pero yo encararia por ese lado.

Saludos!

Vazu.