[Asterisk-Users] Message waiting indicator

Tue Jan 6 11:40:31 MST 2004

Thanks, the phones that I have Polycom Soundpoint IP 500's.  In the specific config file for the phone itself, there are some lines that have to do with MWI and there are three settings to set.  Here is the section of the manual for the phone....

msg.mwi.x.subscribe 	ASCII encoded string containing		If non-Null, the telephone
				digits (the user part of a SIP		will send a
				URL) or a string that constitutes		SUBSCRIBE request
				a valid SIP URL (6416 or			to this contact after
				6416 at polycom.com)					boot-up.

msg.mwi.x.callBackMode 	contact or registration				If set to contact, a call
											will be placed to the
											contact specified in
											the callback attribute
											when the user invokes
											message retrieval. If
											set to registration, a
											call will be placed
											using this registration
											to the contact registered
											(the telephone
											will call itself).

msg.mwi.x.callBack	ASCII encoded string containing		Contact to call when
				digits (the user part of a SIP		retrieving messages
				URL) or a string that constitutes		for this registration.
				a valid SIP URL (6416 or
				6416 at polycom.com)

Does this mean that if the sip entry comes out to phone1 at 192.168.100.210, is that what I put in for the subscribe and callback?  I don't understand the connection between the SUBSCRIBE feature and the NOTIFY

Anyone with Polycom experience with MWI?

I will have to check to see if the NOTIFY is even happening...

Sean

-----Original Message-----
From: Rich Adamson [mailto:radamson at routers.com] 
Sent: Tuesday, January 06, 2004 6:22 AM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] Message waiting indicator

> What is required to get the mwi to work?  Is it more of a phone 
> subject or *?  I have the mailbox= line in sip.conf, but only one 
> extension is named, and in some of the examples, I have seen that there are two...
> What is that all about and how does it affect the extensions.conf and 
> voicemail.conf?

I think the examples that you might have looked are suggesting that when a voicemail is left for a single extension, you "can" place definitions in your sip.conf file that turn on the MWI (message waiting indicator) LED on more then one phone. (I'll leave that up to you to figure out whether that is a feature of use to you.)

Asterisk will occasionally look in the
 /var/spool/asterisk/voicemail/default/3008/INBOX
directory (where 3008 represents the extension number), and if a certain file exists, send a sip message to the extn(s) that you defined in sip.conf as "mailbox=3008".

The sip message sent to the phone (in hex using a packet sniffer) looks like:

0020: c1 5b 13 c4 13 c4 01 e2 58 97 4e 4f 54 49 46 59 | Á[.Ä.Ä.âX-NOTIFY
0030: 20 73 69 70 3a 33 30 30 38 40 32 30 35 2e 32 31 |  sip:3008 at 205.21
0040: 32 2e 31 39 33 2e 37 31 20 53 49 50 2f 32 2e 30 | 2.173.91 SIP/2.0
0050: 0d 0a 56 69 61 3a 20 53 49 50 2f 32 2e 30 2f 55 | ..Via: SIP/2.0/U
0060: 44 50 20 32 30 35 2e 32 31 32 2e 31 39 33 2e 31 | DP 205.212.193.1
0070: 30 31 3a 35 30 36 30 3b 62 72 61 6e 63 68 3d 7a | 01:5060;branch=z
0080: 39 68 47 34 62 4b 33 63 31 63 61 35 65 31 0d 0a | 9hG4bK3c1ca5e1..
0090: 46 72 6f 6d 3a 20 22 61 73 74 65 72 69 73 6b 22 | From: "asterisk"
00a0: 20 3c 73 69 70 3a 61 73 74 65 72 69 73 6b 40 32 |  <sip:asterisk at 2
00b0: 30 35 2e 32 31 32 2e 31 39 33 2e 31 30 31 3e 3b | 05.212.193.101>;
00c0: 74 61 67 3d 61 73 35 37 63 63 64 33 32 65 0d 0a | tag=as57ccd32e..
00d0: 54 6f 3a 20 3c 73 69 70 3a 33 30 30 38 40 32 30 | To: <sip:3008 at 20
00e0: 35 2e 32 31 32 2e 31 39 33 2e 39 31 3e 0d 0a 43 | 5.212.193.91>..C
00f0: 6f 6e 74 61 63 74 3a 20 3c 73 69 70 3a 61 73 74 | ontact: <sip:ast
0100: 65 72 69 73 6b 40 32 30 35 2e 32 31 32 2e 31 39 | erisk at 205.212.19
0110: 33 2e 31 30 31 3e 0d 0a 43 61 6c 6c 2d 49 44 3a | 3.101>..Call-ID:
0120: 20 34 34 66 39 31 38 36 64 34 30 62 30 31 35 33 |  44f9186d40b0153
0130: 30 36 37 39 32 30 31 39 64 33 36 39 35 66 36 31 | 06792019d3695f61
0140: 36 40 32 30 35 2e 32 31 32 2e 31 39 33 2e 31 30 | 6 at 205.212.193.10
0150: 31 0d 0a 43 53 65 71 3a 20 31 30 32 20 4e 4f 54 | 1..CSeq: 102 NOT
0160: 49 46 59 0d 0a 55 73 65 72 2d 41 67 65 6e 74 3a | IFY..User-Agent:
0170: 20 41 73 74 65 72 69 73 6b 20 50 42 58 0d 0a 45 |  Asterisk PBX..E
0180: 76 65 6e 74 3a 20 6d 65 73 73 61 67 65 2d 73 75 | vent: message-su
0190: 6d 6d 61 72 79 0d 0a 43 6f 6e 74 65 6e 74 2d 54 | mmary..Content-T
01a0: 79 70 65 3a 20 61 70 70 6c 69 63 61 74 69 6f 6e | ype: application
01b0: 2f 73 69 6d 70 6c 65 2d 6d 65 73 73 61 67 65 2d | /simple-message-
01c0: 73 75 6d 6d 61 72 79 0d 0a 43 6f 6e 74 65 6e 74 | summary..Content
01d0: 2d 4c 65 6e 67 74 68 3a 20 33 37 0d 0a 0d 0a 4d | -Length: 37....M
01e0: 65 73 73 61 67 65 73 2d 57 61 69 74 69 6e 67 3a | essages-Waiting:
01f0: 20 79 65 73 0a 56 6f 69 63 65 6d 61 69 6c 3a 20 |  yes.Voicemail: 
0200: 31 2f 30 0a                                     | 1/0.

where if you look closely at the text on the right side, you can see data like "Missages-Waiting: yes" in the packet. (You might want to read the RFC that defines what the sip protocol is all about, it will help you understand.)

The hardware/software sip phone is supposed to translate that sip msg and turn on the LED on the phone's panel. Exactly how "each" phone implements that function is up to the phone manufacturer, and like many things in the voip space, some get right while others seem to struggle with the simple things in life.

If you don't have a packet sniffer, then from the asterisk command line, enter "sip debug" and dig through the display for the equivalent message. The interesting piece will look something like:

To: <sip:3008 at 205.212.193.91>
Contact: <sip:asterisk at 205.212.193.101>
Call-ID: 73fecd1b0818b5a104f19b7270c06475 at 205.212.193.101
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Event: message-summary
Content-Type: application/simple-message-summary
Content-Length: 37
Messages-Waiting: yes     <<============
Voicemail: 1/0
 (no NAT) to 205.212.193.91:5060

Sip read: I>
SIP/2.0 200 Ok         <<=============

If your phone's display or MWI LED doesn't function, then use the above to diagnose which component is not working right.

The SIP RFC and "sip debug" command are your friends; get to know them.

Rich

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