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Cisco 79x1 Date and time


jlumby
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I have discovered through Cisco's documentation that the 79x1 phones first tries to set the date and time off of the SIP registration responce, and then they fine tune it off of the NTP server that is listed in their config file. I am having an issue that since the date, and time is not sent in the SIP messaging to the phone, that the clock never gets close enough to use the NTP server. Is there a way to make PBXnSIP send the date, or does anyone know of a workaround? Below is a copy of how a Cisco sends the date from their callmanager.

 

No. Time Source Destination Protocol Info

229 70.598879 192.168.5.199 192.168.5.138 SIP Status: 200 OK (1 bindings)

 

Frame 229 (650 bytes on wire, 650 bytes captured)

Ethernet II, Src: CompaqHp_af:1a:24 (00:0b:cd:af:1a:24), Dst: Cisco_84:61:80 (00:1b:d5:84:61:80)

Internet Protocol, Src: 192.168.5.199 (192.168.5.199), Dst: 192.168.5.138 (192.168.5.138)

Transmission Control Protocol, Src Port: sip (5060), Dst Port: 50294 (50294), Seq: 639, Ack: 1716, Len: 596

Source port: sip (5060)

Destination port: 50294 (50294)

Sequence number: 639 (relative sequence number)

[Next sequence number: 1235 (relative sequence number)]

Acknowledgement number: 1716 (relative ack number)

Header length: 20 bytes

Flags: 0x18 (PSH, ACK)

0... .... = Congestion Window Reduced (CWR): Not set

.0.. .... = ECN-Echo: Not set

..0. .... = Urgent: Not set

...1 .... = Acknowledgment: Set

.... 1... = Push: Set

.... .0.. = Reset: Not set

.... ..0. = Syn: Not set

.... ...0 = Fin: Not set

Window size: 9684

Checksum: 0x4de6 [correct]

[sEQ/ACK analysis]

[This is an ACK to the segment in frame: 228]

[The RTT to ACK the segment was: 0.495541000 seconds]

Session Initiation Protocol

Status-Line: SIP/2.0 200 OK

Status-Code: 200

[Resent Packet: False]

Message Header

Via: SIP/2.0/TCP 192.168.5.138:50294;branch=z9hG4bK47aff438

From: <sip:1009@192.168.5.199>;tag=001bd584618000022a3003a8-470cfe78

SIP from address: sip:1009@192.168.5.199

SIP tag: 001bd584618000022a3003a8-470cfe78

To: <sip:1009@192.168.5.199>;tag=436104038

SIP to address: sip:1009@192.168.5.199

SIP tag: 436104038

Date: Tue, 20 May 2008 22:04:19 GMT

Call-ID: 001bd584-61800003-92fe3868-3a9464b8@192.168.5.138

CSeq: 101 REGISTER

Sequence Number: 101

Method: REGISTER

Expires: 120

Contact: <sip:00857d4c-4c71-4a69-8590-2714e50f8c3c@192.168.5.138:50294;transport=tcp>;+sip.instance="<urn:uuid:00000000-0000-0000-0000-001bd5846180>";+u.sip!model.ccm.cisco.com="30018";x-cisco-newreg

Contact Binding: <sip:00857d4c-4c71-4a69-8590-2714e50f8c3c@192.168.5.138:50294;transport=tcp>;+sip.instance="<urn:uuid:00000000-0000-0000-0000-001bd5846180>";+u.sip!model.ccm.cisco.com="30018";x-cisco-newreg

Supported: X-cisco-srtp-fallback,X-cisco-sis-2.0.0

Content-Length: 0

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I have discovered through Cisco's documentation that the 79x1 phones first tries to set the date and time off of the SIP registration responce, and then they fine tune it off of the NTP server that is listed in their config file. I am having an issue that since the date, and time is not sent in the SIP messaging to the phone, that the clock never gets close enough to use the NTP server. Is there a way to make PBXnSIP send the date, or does anyone know of a workaround? Below is a copy of how a Cisco sends the date from their callmanager.

 

Whow. Actually it is no big problem to put that in. Is GMT always fine or does the phone expect "local" time (wherever the phone is)?

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