Inter-connection between two Asterisk servers using SIP

角色

The following case shows the way to inter-connect two Asterisk servers such that users in different location can not only call internal extension numbers but also other person's extension numbers in other location directly.

Server 1:

Location: TW
Hostanme: tw.asterisk.org
Network segment: 192.168.1.0
Extension 2001: John
Extension 2002: Susan

Server 2:

Location: SZ
Hostname: sz.asterisk.org
Network segment: 192.168.2.0
Extension 3001: Peter
Extension 3002: Mary

Server 1: TW Settings:
sip.conf

1. [general]
   
2. srvlookup=yes
   
3. nat=yes
   
4. realm=tw.asterisk.org
   
5. externhost=tw.asterisk.org
   
6. fromdomain=tw.asterisk.org
   
7. localnet=192.168.1.0/255.255.255.0
   
8. externrefresh = 1
   
9. defaultexpirey=120
   
10. bindport=5060
    
11. qualify=yes
    
12. disallow=all
    
13. allow=alaw
    
14. allow=ulaw
    
15. allow=gsm
    
16. context=front-desk
    
17. 
    
18. [2001]
    
19. type=friend
    
20. username=2001
    
21. secret=2001_password
    
22. callerid="John" <2001>
    
23. quality=yes
    
24. nat=yes
    
25. host=dynamic
    
26. canreinvite=no
    
27. disallow=all
    
28. allow=alaw
    
29. context=internal
    
30. 
    
31. [2002]
    
32. type=friend
    
33. username=2002
    
34. secret=2002_password
    
35. callerid="Susan" <2002>
    
36. quality=yes
    
37. nat=yes
    
38. host=dynamic
    
39. canreinvite=no
    
40. disallow=all
    
41. allow=alaw
    
42. context=internal
    
43. 
    
44. ;from SZ users call 2xxxx
    
45. [tw-gw]
    
46. type=user
    
47. username=tw-gw
    
48. secret=tw-gw_password
    
49. qualify=yes
    
50. nat=yes
    
51. host=dynamic
    
52. canreinvite=no
    
53. disallow=all
    
54. allow=ulaw,alaw,gsm
    
55. context=internal
    
56. 
    
57. ;to SZ telephone 3xxx
    
58. [sz-gw]
    
59. type=peer
    
60. username=sz-gw
    
61. secret=sz-gw_password
    
62. host=sz.asterisk.org
    
63. insecure=port,invite
    
64. context=internal

複製代碼

extensions.conf

1. [trunk_sz-gw]
   
2. exten => _3XXX,1,Dial(SIP/${EXTEN}@sz-gw,,)
   
3. exten => _3XXX,2,Hangup()
   
4. 
   
5. [internal]
   
6. include => trunk_sz-gw
   
7. 
   
8. exten => 2001,1,Dial(SIP/2001,,r)
   
9. exten => 2002,1,Dial(SIP/2002,,r)

複製代碼

Server 2: SZ Settings:

sip.conf

1. [general]
   
2. bindport=5060
   
3. srvlookup=yes
   
4. realm=sz.asterisk.org
   
5. externhost=sz.asterisk.org
   
6. fromdomain=sz.asterisk.org
   
7. localnet=192.168.2.0/255.255.255.0
   
8. defaultexpirey=120
   
9. externrefresh = 1
   
10. disallow=all
    
11. allow=alaw,ulaw,gsm,g729,iLBC,speex
    
12. nat=yes
    
13. canreinvite=no
    
14. insecure=port,invite
    
15. qualify=yes
    
16. dtmfmode=rfc2833
    
17. context=fron-desk
    
18. 
    
19. [3001]
    
20. type=friend
    
21. username=3001
    
22. callerid="John" <3001>
    
23. secret=3001_password
    
24. host=dynamic
    
25. context=internal
    
26. 
    
27. [3002]
    
28. type=friend
    
29. username=3002
    
30. callerid="Mary" <3002>
    
31. secret=3002_password
    
32. host=dynamic
    
33. context=internal
    
34. 
    
35. ;from TW users call 3xxx
    
36. [sz-gw]
    
37. type=user
    
38. username=sz-gw
    
39. secret=sz-gw_password
    
40. qualify=yes
    
41. nat=yes
    
42. host=dynamic
    
43. canreinvite=no
    
44. disallow=all
    
45. allow=alaw,ulaw,gsm
    
46. context=internal
    
47. 
    
48. 
    
49. ;to TW telephone 2xxx
    
50. [tw-gw]
    
51. type=peer
    
52. username=tw-gw
    
53. secret=tw-gw_password
    
54. host=tw.asterisk.org
    
55. insecure=port,invite
    
56. context=internal

複製代碼

extensions.conf

1. [trunk_tw-gw]
   
2. exten => _2XXX,1,Dial(SIP/tw-gw/${EXTEN},,)
   
3. exten => _2XXX,n,Hangup()
   
4. 
   
5. [internal]
   
6. include => trunk_tw-gw
   
7. 
   
8. exten => 3001,1,Dial(SIP/3001,,r)
   
9. exten => 3002,1,Dial(SIP/3002,,r)

複製代碼