SIP Asterisk Pequeña Odisea || Raza, aqui esta el Log

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Que tal amigos, ante ayer posteé este tema pero no tuve tiempo de probar lo que Raza Metal me recomendó.
Bueno, la historia es que tengo un Asterisk en internet con una IP XXXX.XXXX.XXXX.XXXX. Por el momento este servidor está solo en Internet.
Ahora, tengo otro servidor, el Firewall/Proxy/Router con una IP YYYY.YYYY.YYYY.YYYY, conectado a un segmento de red 10.0.0.0/24.
Intento hacer una llamada desde un cliente, en este caso 10.0.0.181 (de jose) hacia la máquina 10.0.0.104 (de diego). Como es comprensible, ambos usuarios deben registrarse en el asterisk atravesando el firewall hacia la dirección YYYY.YYYY.YYYY.YYYY y luego de ello diego llama a jose y debería establecerse la llamada.
Como indico, el Asterisk está en Internet.
Inicialmente, los clientes no se registraban y para descartar el bloqueo del firewall, lo detuve y dejé las políticas de todas las cadenas por defecto en ACCEPT, agregando unicamente la regla que hace NAT (enmascaramiento). Al hacer eso supongo que todo el tráfico desde y hacia Internet será acaptado, por esa razón debería descartar cualquier bloqueo de puertos. Bueno, eso es lo que supongo :( .

Panorama Real.
La situación es que los usuarios logran registrarse con éxito y al llamar de diego a jose en este caso se establece la llamada, PERO NO HAY AUDIO ENTRE LAS EXTENSIONES. Este servidor ya se probó dentro de la LAN que mencioné como servidor interno y ningún problema de audio, descartando por ello cualquier error de configuración de micrófonos o tarjeta de sonido.

SALIDA DE LOG
Raza, aquí está el log desde el registro de los usuarios (diego y jose), hasta el establecimiento de la llamada y el colgado.

May 2 11:33:51 VERBOSE[25296] logger.c: -- Registered SIP 'diego' at XXXX.XXXX.XXXX.XXXX port 8798 expires 3600
May 2 11:33:51 DEBUG[25296] chan_sip.c: Stopping retransmission on '3e1f7b171cd7793420caa8613864c6bd@YYYY.YYYY.YYYY.YYYY' of Request 102: Match Found
May 2 11:33:51 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:33:51 DEBUG[25296] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:06 DEBUG[25296] chan_sip.c: Auto destroying call 'M2JlZGRhOGQ1NGNiZGJkZTRjYjZhY2U1MTY4ZWYwNTE.'
May 2 11:34:11 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:11 DEBUG[25296] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:11 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:11 DEBUG[25296] chan_sip.c: Target address XXXX.XXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:11 VERBOSE[25296] logger.c: -- Registered SIP 'jose' at XXXX.XXXX.XXXX.XXXX port 56676 expires 3600
May 2 11:34:11 DEBUG[25296] chan_sip.c: Stopping retransmission on '32422dec3345b11d0a50f4db7d4a409d@YYYY.YYYY.YYYY.YYYY' of Request 102: Match Found
May 2 11:34:11 VERBOSE[25296] logger.c: -- Unregistered SIP 'jose'
May 2 11:34:11 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:11 DEBUG[25296] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:11 VERBOSE[25296] logger.c: -- Registered SIP 'jose' at XXXX.XXXX.XXXX.XXXX port 56676 expires 3600
May 2 11:34:11 DEBUG[25296] chan_sip.c: Stopping retransmission on '50e20bb4387cd78e686f905d0730f685@YYYY.YYYY.YYYY.YYYY' of Request 102: Match Found
May 2 11:34:12 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:12 DEBUG[25296] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:21 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:21 DEBUG[25296] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:21 DEBUG[25296] chan_sip.c: Setting NAT on RTP to 524288
May 2 11:34:21 DEBUG[25296] chan_sip.c: Setting NAT on VRTP to 524288
May 2 11:34:21 DEBUG[25296] chan_sip.c: Stopping retransmission on 'Zjc5OTYyOTJjYWI0NTk3OTZhZGVkY2M4NTFkYjkxMmI.' of Response 1: Match Found
May 2 11:34:22 DEBUG[25296] chan_sip.c: Setting NAT on RTP to 524288
May 2 11:34:22 DEBUG[25296] chan_sip.c: Setting NAT on VRTP to 524288
May 2 11:34:22 DEBUG[25296] chan_sip.c: Checking SIP call limits for device diego
May 2 11:34:22 DEBUG[25296] chan_sip.c: build_route: Contact hop:
May 2 11:34:22 VERBOSE[25316] logger.c: -- Executing Dial("SIP/diego-099f4d38", "SIP/jose|20") in new stack
May 2 11:34:22 DEBUG[25316] chan_sip.c: Setting NAT on RTP to 524288
May 2 11:34:22 DEBUG[25316] chan_sip.c: Setting NAT on VRTP to 524288
May 2 11:34:22 DEBUG[25316] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:22 DEBUG[25316] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:22 DEBUG[25316] chan_sip.c: Outgoing Call for jose
May 2 11:34:22 VERBOSE[25316] logger.c: -- Called jose
May 2 11:34:22 DEBUG[25296] chan_sip.c: (Provisional) Stopping retransmission (but retaining packet) on '4675bc82651a46e449cf0a505fb433fc@YYYY.YYYY.YYYY.YYYY' Request 102: Found
May 2 11:34:22 VERBOSE[25316] logger.c: -- SIP/jose-099fcb98 is ringing
May 2 11:34:26 DEBUG[25296] chan_sip.c: Auto destroying call 'MDFjNTBjZmMzOTUzMmEwMDYzMjgzMWQ4NjQ3NzY2NGQ.'
May 2 11:34:33 DEBUG[25296] chan_sip.c: Acked pending invite 102
May 2 11:34:33 DEBUG[25296] chan_sip.c: Stopping retransmission on '4675bc82651a46e449cf0a505fb433fc@YYYY.YYYY.YYYY.YYYY' of Request 102: Match Found
May 2 11:34:33 DEBUG[25296] chan_sip.c: build_route: Contact hop:
May 2 11:34:33 VERBOSE[25316] logger.c: -- SIP/jose-099fcb98 answered SIP/diego-099f4d38
May 2 11:34:33 VERBOSE[25316] logger.c: -- Attempting native bridge of SIP/diego-099f4d38 and SIP/jose-099fcb98
May 2 11:34:33 DEBUG[25296] chan_sip.c: Stopping retransmission on 'Zjc5OTYyOTJjYWI0NTk3OTZhZGVkY2M4NTFkYjkxMmI.' of Response 2: Match Found
May 2 11:34:41 DEBUG[25316] channel.c: Didn't get a frame from channel: SIP/jose-099fcb98
May 2 11:34:41 DEBUG[25316] channel.c: Bridge stops bridging channels SIP/diego-099f4d38 and SIP/jose-099fcb98
May 2 11:34:41 DEBUG[25316] chan_sip.c: update_call_counter(jose) - decrement call limit counter
May 2 11:34:41 DEBUG[25316] app_dial.c: Exiting with DIALSTATUS=ANSWER.
May 2 11:34:41 VERBOSE[25316] logger.c: == Spawn extension (internal, 101, 1) exited non-zero on 'SIP/diego-099f4d38'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '"diego" '
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'diego'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '101'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'internal'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'SIP/diego-099f4d38'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'SIP/jose-099fcb98'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'Dial'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'SIP/jose|20'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '2007-05-02 11:34:22'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '2007-05-02 11:34:33'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '2007-05-02 11:34:41'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '19'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '8'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'ANSWERED'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is 'DOCUMENTATION'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '(null)'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '1178123662.0'
May 2 11:34:41 DEBUG[25316] pbx.c: Function result is '(null)'
May 2 11:34:41 DEBUG[25316] chan_sip.c: update_call_counter(diego) - decrement call limit counter
May 2 11:34:41 DEBUG[25296] chan_sip.c: Stopping retransmission on 'Zjc5OTYyOTJjYWI0NTk3OTZhZGVkY2M4NTFkYjkxMmI.' of Request 102: Match Found
May 2 11:34:51 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:51 DEBUG[25296] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip
May 2 11:34:51 DEBUG[25296] chan_sip.c: Stopping retransmission on '6ec372660a7bfa0855d9ea30065c5be1@YYYY.YYYY.YYYY.YYYY' of Request 102: Match Found
May 2 11:34:52 DEBUG[25296] acl.c: ##### Testing XXXX.XXXX.XXXX.XXXX with 10.0.0.0
May 2 11:34:52 DEBUG[25296] chan_sip.c: Target address XXXX.XXXX.XXXX.XXXX is not local, substituting externip

Si me pueden dar una mano les agradecería un montón.

Atte.
Jose Antonio L'enchanteur