Gracias a el apoyo y guia de Lourdes, ayer pude instalar Asterisk ayer @ 12:30 am, le puse unas simple configuracion para hacerle funcionar a este aparatito Welltech IAD 162 que soporta SIP, pero no funciono!! se quedaba la luz de Status Parpeadando, je je je (gracias a mi amigo que le estaba arreglando la computadora(Pedro) que repetia "vos y tus hue"#$%s", fue un chevere apoyo moral!! je je je, pero bueno, aqui esta la configuracion, que le agregue a sip.conf

[2299]
type=friend
username=2299
secret=alexandra
canreinvite=no
host=dynamic
dtmfmode=rfc2833
mailbox=2299
nat=1

Aqui esta lo que pasaba y porque no se conectaba

07:38:57.848719 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 390
07:38:57.848768 IP 10.3.0.1 > 10.3.0.2: icmp 426: host 10.3.0.1 unreachable - admin prohibited
07:38:58.357828 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 390
07:38:58.357874 IP 10.3.0.1 > 10.3.0.2: icmp 426: host 10.3.0.1 unreachable - admin prohibited
07:38:59.367815 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 390
07:38:59.367885 IP 10.3.0.1 > 10.3.0.2: icmp 426: host 10.3.0.1 unreachable - admin prohibited
07:39:01.377761 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 390
07:39:01.377808 IP 10.3.0.1 > 10.3.0.2: icmp 426: host 10.3.0.1 unreachable - admin prohibited
07:39:02.847285 arp who-has 10.3.0.2 tell 10.3.0.1
07:39:02.848409 arp reply 10.3.0.2 is-at 00:01:a8:01:9c:f3
07:39:05.387581 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 390
07:39:05.387631 IP 10.3.0.1 > 10.3.0.2: icmp 426: host 10.3.0.1 unreachable - admin prohibited
07:39:55.864896 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:39:55.864943 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:39:56.375149 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:39:56.375199 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:39:57.385084 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:39:57.385133 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:39:59.395062 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:39:59.395112 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:40:00.863466 arp who-has 10.3.0.2 tell 10.3.0.1
07:40:00.864259 arp reply 10.3.0.2 is-at 00:01:a8:01:9c:f3
07:40:03.404906 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:40:03.404951 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:40:53.876821 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:40:53.876872 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:40:54.386852 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:40:54.386899 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:40:55.396803 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:40:55.396852 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:40:57.407459 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:40:57.407507 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited
07:40:58.875648 arp who-has 10.3.0.2 tell 10.3.0.1
07:40:58.876452 arp reply 10.3.0.2 is-at 00:01:a8:01:9c:f3
07:41:01.417048 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 389
07:41:01.417093 IP 10.3.0.1 > 10.3.0.2: icmp 425: host 10.3.0.1 unreachable - admin prohibited

36 packets captured
36 packets received by filter
0 packets dropped by kernel
[root@mailserver ~]# service iptables stop
Expurgar reglas del cortafuegos: [ OK ]
Configuración de cadenas a la política ACCEPT: filter [ OK ]
Descargando módulos iptables: [ OK ]
[root@mailserver ~]# tcpdump
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
07:42:00.214741 arp who-has 192.168.4.81 tell 192.168.4.81
07:42:54.055762 arp who-has 192.168.4.169 tell 192.168.4.169
07:42:54.267706 arp who-has 10.3.0.2 tell 10.3.0.2
07:42:54.279033 arp who-has 10.3.0.1 tell 10.3.0.2
07:42:54.279065 arp reply 10.3.0.1 is-at 00:11:5b:3c:f6:8f
07:42:54.280182 IP 10.3.0.2 > mailserver.cspmsa.com: icmp 64: echo request seq 0
07:42:55.279705 IP 10.3.0.2 > mailserver.cspmsa.com: icmp 64: echo request seq 1
07:42:56.279662 IP 10.3.0.2 > mailserver.cspmsa.com: icmp 64: echo request seq 2
07:42:57.279640 IP 10.3.0.2 > mailserver.cspmsa.com: icmp 64: echo request seq 3
07:42:58.279601 IP 10.3.0.2 > mailserver.cspmsa.com: icmp 64: echo request seq 4
07:43:02.448830 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 376
07:43:02.504093 IP 10.3.0.1.5060 > 10.3.0.2.5060: UDP, length 376
07:43:02.504186 IP 10.3.0.1.5060 > 10.3.0.2.5060: UDP, length 458
07:43:02.834958 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 536
07:43:02.835169 IP 10.3.0.1.5060 > 10.3.0.2.5060: UDP, length 376
07:43:02.850097 IP 10.3.0.1.5060 > 10.3.0.2.5060: UDP, length 453
07:43:05.852576 IP 10.3.0.1.5060 > 10.3.0.2.5060: UDP, length 519
07:43:05.915333 IP 10.3.0.2.5060 > 10.3.0.1.5060: UDP, length 309
07:43:07.503091 arp who-has 10.3.0.2 tell 10.3.0.1
07:43:07.503930 arp reply 10.3.0.2 is-at 00:01:a8:01:9c:f3

Esto lo intente hoy a las siete de mañana y funciono, ya tiene un tono distinto, y ya dejo de titilar la luz!

Ahora me toca probar haber si funciona!

Cualquier comentario o concejo sera bien venido

Saludos!!

P.D. Gracias Lourdes y Pedro por su acolite