CHAPTER28 Configuring Supplementary Services
Mediant 1000 Gateway & E-SBC | User's Manual
● Manipulation rules can be configured for the calling (ANI) and called number (but
not on the "display" string), for example, to strip 00 from the ANI "00INXXYYYY".
● The called number, received as userpart of the Request URI ("301" in the example
below), can be used to route incoming SIP calls to FXO specific ports, using the
TrunkGroup and PSTNPrefix parameters.
● When the PSAP party off-hooks and then immediately on-hooks (i.e., the device
detects wink), the device releases the call sending SIP response "403 Forbidden"
and the release reason 21 (i.e., call rejected) "Reason: Q.850 ;cause=21" is sent.
Using the cause mapping parameter, it is possible to change the 403 to any other
SIP reason, for example, to 603.
● Sometimes a wink signal sent immediately after the FXO device seizes the line is
not detected. To overcome this problem, configure the parameter
TimeToSampleAnalogLineVoltage to 100 (instead of 1000 msec, which is the
default value). The wink is then detected only after this timeout + 50 msec
(minimum 150 msec).
Below are two examples for a) INVITE messages and b) INFO messages generated by hook-flash.
■ Example A: INVITE message with ANI = 333333444444 and pseudo-ANI = 0123456789:
INVITE sip:301@10.33.37.79;user=phone SIP/2.0
Via: SIP/2.0/UDP 10.33.37.78;branch=z9hG4bKac771627168
Max-Forwards: 70
From: "0123456789" <sip:333333444444@example.com>;tag=1c771623824
To: <sip:301@10.33.37.79;user=phone>
Call-ID: 77162335841200014153@10.33.37.78
CSeq: 1 INVITE
Contact: <sip:101@10.33.37.78>
Supported: em,100rel,timer,replaces,path
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO
,SUBSCRIBE,UPDATE
User-Agent: AudioCodes-Sip-Gateway-FXO/7.20A.252.011
Privacy: none
P-Asserted-Identity: "0123456789" <sip:3333344444@example.com>
Content-Type: application/sdp
Content-Length: 253
v=0
o=AudioCodesGW 771609035 771608915 IN IP4 10.33.37.78
s=Phone-Call
c=IN IP4 10.33.37.78
t=0 0
m=audio 4000 RTP/AVP 8 0 101
a=rtpmap:8 pcma/8000
a=rtpmap:0 pcmu/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=ptime:20
a=sendrecv
■ Example B: The detection of a Wink signal generates the following SIP INFO message:
- 673 -
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