[AsteriskBrasil] Chamadas redirecionadas para o Asterisk

[Anderson Carvalho]

Boa tarde pessoal,

Tenho a seguinte situação. Possuo uma central telefônica IP da 3Com e
configurei nela o redirecionamento para o meu Asterisk. 
A dúvida é a seguinte... Eu preciso configurar alguma rota de entrada no
Asterisk?
Estou utilizando somente para estes testes o Asterisk em home
Nos logs apareceu o seguinte:

Jun 16 16:52:05 DEBUG[2725] chan_sip.c: Hm.... No sdp for the moment
Jun 16 16:52:05 DEBUG[2725] chan_sip.c: Checking SIP call limits for device 
Jun 16 16:52:05 DEBUG[2725] chan_sip.c: build_route: Contact hop:
"3ComCallProcessor" 
Jun 16 16:52:05 VERBOSE[3352] logger.c: -- Executing
Set("SIP/20.1.1.10-0a105ba0", "TIMEOUT(absolute)=15") in new stack
Jun 16 16:52:05 VERBOSE[3352] logger.c: -- Channel will hangup at 2008-06-16
19:52:20 UTC.
Jun 16 16:52:05 VERBOSE[3352] logger.c: -- Executing
Congestion("SIP/20.1.1.10-0a105ba0", "") in new stack
Jun 16 16:52:05 VERBOSE[3352] logger.c: == Spawn extension
(from-sip-external, 5500, 2) exited non-zero on 'SIP/20.1.1.10-0a105ba0'
Jun 16 16:52:05 VERBOSE[3352] logger.c: -- Executing
Set("SIP/20.1.1.10-0a105ba0", "TIMEOUT(absolute)=15") in new stack
Jun 16 16:52:05 VERBOSE[3352] logger.c: -- Channel will hangup at 2008-06-16
19:52:20 UTC.
Jun 16 16:52:05 VERBOSE[3352] logger.c: -- Executing
Congestion("SIP/20.1.1.10-0a105ba0", "") in new stack
Jun 16 16:52:05 VERBOSE[3352] logger.c: == Spawn extension
(from-sip-external, h, 2) exited non-zero on 'SIP/20.1.1.10-0a105ba0'
Jun 16 16:52:05 DEBUG[3352] cdr_addon_mysql.c: cdr_mysql: inserting a CDR
record.
Jun 16 16:52:05 DEBUG[3352] cdr_addon_mysql.c: cdr_mysql: SQL command as
follows: INSERT INTO cdr
(calldate,clid,src,dst,dcontext,channel,dstchannel,lastapp,lastdata,duration
,billsec,disposition,amaflags,accountcode,uniqueid) VALUES ('2008-06-16
16:52:05','\"New User\" <7765>','7765','5500','from-sip-external',
'SIP/20.1.1.10-0a105ba0','','Congestion','',0,0,'NO
ANSWER',3,'','1213645925.7')
Jun 16 16:52:05 DEBUG[3352] chan_sip.c: update_call_counter() - decrement
call limit counter
Jun 16 16:52:05 DEBUG[2725] chan_sip.c: Stopping retransmission on
'1A1213644158B1C em 189.7.9.6' of Response 1: Match Not Found
Jun 16 16:52:05 DEBUG[2725] chan_sip.c: Stopping retransmission on
'1A1213644158B1C em 189.7.9.6' of Response 1: Match Not Found

20.1.1.10 é o endereço da central 3Com e 189.9.7.6 é o endereço do Asterisk.
Não existe nenhum problema de conexão. As portas foram liberadas no
firewall.

Alguém sabe o que poderia estar acontecendo?

Obrigado.