IWF Privacy Caller Privacy on Secure Connections
In prior releases, when the H.323 endpoint sends a SETUP with presentation indicator set to allowed, the Oracle® Enterprise Session Border Controller does not insert the P-Asserted-Identity in the INVITE. The SIP INVITE needs the P-Asserted-Identity header to support calling line identification presentation (CLIP) to calling line identification restriction (CLIR) in an IP multimedia subsystem (IMS) solution. This feature lets the Oracle® Enterprise Session Border Controller insert the P-Asserted-Identity in the INVITE when the presentation indicator is set to allowed.
- CLIP is a service provided to the called party that allows the display of the calling number (caller ID). The user-provided calling number must be transported from the caller to the called party.
- CLIR is a service provided to the calling party that lets it indicate whether or not the calling number is to be displayed to the called party. It sets a calling number presentation indicator to allowed or restricted. Regulations require that network administrations remove the calling number before it is sent to the called party, if the calling party has so requested.
H.323 to SIP IWF
When the Oracle® Enterprise Session Border Controller translates incoming H.323 messages to SIP on a secure connection (which means the Oracle® Enterprise Session Border Controller can rely on the data sent from the originator); it will translate the information in the H.323 messages into SIP messages as detailed in the following sections.
Calls with Presentation Allowed
When the Oracle® Enterprise Session Border ControllerC receives a SETUP from the H.323 domain where presentation is allowed, it generates an INVITE to the SIP domain with the following header. (Presentation is allowed when the calling party’s information element presentation indicator (octet 3a) equals 00.)
- P-Asserted-ID: the userpart should be derived from the Calling Party Number Information Element digits.
H.323 to SIP
When h323d receives a SETUP with the calling party’s information element presentation indicator set to allowed, the Oracle® Enterprise Session Border Controller will add the P-Asserted-Identity header to the INVITE. The P-Asserted-Identity is very similar to the FROM header, except for the tag.
Sample SETUP sent from h323d to Remote H323 Endpoints
Q.931 Protocol discriminator: Q.931 Call reference value length: 2 Call reference flag: Message sent from originating side Call reference value: 2F62 Message type: SETUP (0x05) Bearer capability Information element: Bearer capability Length: 3 ...0 1000 = Information transfer capability: Unrestricted digital information (0x08) .00. .... = Coding standard: ITU-T standardized coding (0x00) 1... .... = Extension indicator: last octet ...1 0011 = Information transfer rate: 384 kbit/s (0x13) .00. .... = Transfer mode: Circuit mode (0x00) 1... .... = Extension indicator: last octet ...0 0101 = User information layer 1 protocol: Recommendation H.221 and H.242 (0x05) 1... .... = Extension indicator: last octet Display 'jdoe\000' Information element: Display Length: 9 Display information: jdoe\000 Calling party number: '42343' Information element: Calling party number Length: 6 .... 1001 = Numbering plan: Private numbering (0x09) .110 .... = Number type: Abbreviated number (0x06) 0... .... = Extension indicator: information continues through the next octet .... ..00 = Screening indicator: User-provided, not screened (0x00) .00. .... = Presentation indicator: Presentation allowed (0x00) 1... .... = Extension indicator: last octet Calling party number digits: 42343
SIP to H.323
When the sipd receives an INVITE with the P-Asserted-Identity header but without the Privacy header, the Oracle® Enterprise Session Border Controller will set the presentation indicator to allowed in H.323’s SETUP.
When the Privacy header is present with the value id, the presentation indicator will be set to restricted. The Oracle® Enterprise Session Border Controller does not support any other value for the Privacy header and so for those call flows, the presentation indicator will be absent in the SETUP.
Example 1 INVITE from sip EP to sipd
Apr 20 04:43:54.220 On [0:0]192.168.200.68:5060 received from 192.168.200.6:5062 INVITE sip:800@192.168.200.68:5060 SIP/2.0 Via: SIP/2.0/UDP 192.168.200.6:5062 From: sipp <sip:7789@192.168.200.6:5062>;tag=1 To: sut <sip:800@192.168.200.68:5060> P-Asserted-Identity: sipp <sip:7789@192.168.200.6:5062> Call-ID: 1.1336.192.168.200.6@sipp.call.id Cseq: 1 INVITE Contact: sip:7789@192.168.200.6:5062 Max-Forwards: 70 Subject: Performance Test Content-Type: application/sdp Content-Length: 136 ^M v=0 o=user1 53655765 2353687637 IN IP4 127.0.0.1 s=- t=0 0 c=IN IP4 127.0.0.1 m=audio 10000 RTP/AVP 0 a=rtpmap:0 PCMU/8000
Example INVITE from sipd to h323d
Apr 20 04:43:54.240 On 127.0.0.1:5070 received from 127.0.0.1:5060
INVITE sip:800@127.0.0.1:5070;acme_sag=sag1;acme_irealm=internal SIP/2.0
Via: SIP/2.0/UDP 127.0.0.1:5060;branch=z9hG4bK000c0210385hv9gpt001.1
From: sipp <sip:7789@192.168.200.6:5062>;tag=SDk0jpc01-1
To: sut <sip:800@192.168.200.68:5060>
Call-ID: SDk0jpc01-8e15e11e7f9a20523462972843c7e579-06ahc21
Cseq: 1 INVITE
Contact: <sip:7789@192.168.200.68:5060;transport=udp>
Max-Forwards: 69
Subject: Performance Test
Content-Type: application/sdp
Content-Length: 136
GenericID: 160400004@000825010100
v=0
o=user1 53655765 2353687637 IN IP4 127.0.0.1
s=-
t=0 0
c=IN IP4 127.0.0.1
m=audio 10000 RTP/AVP 0
a=rtpmap:0 PCMU/8000
Sample SETUP sent from h323d to remote H323 EP
Q.931
Protocol discriminator: Q.931
Call reference value length: 2
Call reference flag: Message sent from originating side
Call reference value: 664D
Message type: SETUP (0x05)
Bearer capability
Information element: Bearer capability
Length: 3
...1 0000 = Information transfer capability: 3.1 kHz audio (0x10)
.00. .... = Coding standard: ITU-T standardized coding (0x00)
1... .... = Extension indicator: last octet
...1 0000 = Information transfer rate: 64 kbit/s (0x10)
.00. .... = Transfer mode: Circuit mode (0x00)
1... .... = Extension indicator: last octet
...0 0011 = User information layer 1 protocol: Recommendation G.711 A-law (0x03)
1... .... = Extension indicator: last octet
Display 'sipp'
Information element: Display
Length: 4
Display information: sipp
Calling party number: '7789'
Information element: Calling party number
Length: 6
.... 1001 = Numbering plan: Private numbering (0x09)
.110 .... = Number type: Abbreviated number (0x06)
0... .... = Extension indicator: information continues through the next octet
.... ..00 = Screening indicator: User-provided, not screened (0x00)
.00. .... = Presentation indicator: Presentation all 1... .... = Extension indicator: last octet
Calling party number digits: 7789
