Appendix A SIP Compliance with
SIP Header Fields
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| Header Field | Supported? |
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| Authorization | Yes | |||
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| Yes | ||||
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| Contact | Yes | |||
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| Yes | ||||
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| Yes | ||||
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| Yes | ||||
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| Cseq | Yes | |||
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| Date | Yes | |||
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| Encryption | No | |||
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| Expires | Yes | |||
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| From | Yes | |||
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| Hide | No | |||
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| Yes | ||||
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| Organization | No | |||
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| Priority | No | |||
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| Yes | ||||
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| Yes | ||||
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| Yes | ||||
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| ReBy | Yes | |||
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| Yes | ||||
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| Require | Yes | |||
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| No | ||||
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| Yes | ||||
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| Route | Yes | |||
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| Cisco SIP IP Phone 7960 Administrator Guide |
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