no reply to our critical SIP packet. - asterisk-es | Grupos de Google

no reply to our critical SIP packet. - asterisk-es | Grupos de Google: "Si el prblema lo tienes con una extension remota y no con una local,
tu pregunta está respondida al formularse.
Seguramente algún problema al hacer NAT detrás de un router. Si tienes
routers o firewalls en medio, comprueba que la configuración de estos
sea la correcta.

Saludos (te dejo una copia del documento de Asterisk que explica un
poco el por que de estas situaciones)

docs/sip-retransmit.txt

What is the problem with SIP retransmits?
-----------------------------------------

Sometimes you get messages in the console like these:

- 'retrans_pkt: Hanging up call XX77yy - no reply to our critical
packet.'
- 'retrans_pkt: Cancelling retransmit of OPTIONs'

The SIP protocol is based on requests and replies. Both sides send
requests and wait for replies. Some of these requests are important.
In a TCP/IP network many things can happen with IP packets. Firewalls,
NAT devices, Session Border Controllers and SIP Proxys are in the
signalling path and they will affect the call.

SIP Call setup - INVITE-200 OK - ACK
------------------------------------
To set up a SIP call, there's an INVITE transaction. The SIP software
that
initiates the call sends an INVITE, then wait to get a reply. When a
reply arrives, the ca"