SIP Registration problem

Con un telefono SPA-942 registrando contra un Call Manager Express CME 2811. Se produce el siguiente error

001572: Mar  4 18:35:04.451: VOICE_REG_POOL: Register request for (209) from (172.26.0.165)
001573: Mar  4 18:35:04.451: VOICE_REG_POOL: key(24A29510001F0CA0) added to nonce table
001574: Mar  4 18:35:04.451: VOICE_REG_POOL: Contact doesn’t match any pools
001575: Mar  4 18:35:04.483: VOICE_REG_POOL: Register request for (209) from (172.26.0.165)
001576: Mar  4 18:35:04.483: VOICE_REG_POOL: Contact matches pool 3 number list 1
001577: Mar  4 18:35:04.483: VOICE_REG_POOL: key(209) contact(172.26.0.165) add to contact table
001578: Mar  4 18:35:04.483: VOICE_REG_POOL: No entry for (209) found in contact table
001579: Mar  4 18:35:04.483: VOICE_REG_POOL: key(209) contact(172.26.0.165) added to contact table

The registration attempts fail and the Contact doesn’t match any pools. debug error messages appear.

Solucion segun Cisco:

https://supportforums.cisco.com/docs/DOC-3529/diff;jsessionid=603C36028B1F5C731615E915A4A4F96E.node0?secondVersionNumber=2

No me funciona, pero encuentro la nota:

http://www.cisco.com/en/US/products/sw/voicesw/ps4625/products_configuration_example09186a00808f9666.shtml

Basicamente lo que cambie es lo siguiente, con anterioridad todo funcionaba sin problemas.

voice register global

max-dn 42
max-pool 42
authenticate register
tftp-path flash:
create profile sync

Para cada una de la extensiones genero

voice register dn  1
number Numero_de_extension
call-forward b2bua noan 100 timeout 20
allow watch
name Nombreparaidentificar
label Nombreparaidentificar

En el register pool

voice register pool  2
id mac 000E.0000.0000
preference 2
number 1 dn 1
incoming called-number Numero_de_extension
dtmf-relay sip-notify
username user3 password laquesea
voice-class codec 1

Ahora en los telefonos colocas el usuario y la password y registran sin problemas.