User's Manual 526 Document #: LTRT-89730
Mediant 3000
26.2 Interworking Keypad DTMFs for SIP-to-ISDN Calls
The device can interwork DTMF tones received from the IP to the PSTN, using the ISDN
Keypad Facility information element (IE) in Q.931 INFORMATION messages. This feature
is applicable only to the Euro ISDN variant (User side).
If the device receives from the IP side an INVITE message whose called party number (To
header) contains the asterisk (*) or pound (#) character, or a SIP NOTIFY or SIP INFO
message that contains these characters (e.g., 123#456), the device sends the character
and the digits positioned to its right, as Keypad IE in the INFORMATION message. The
device sends only the digits positioned before the character to the PSTN (in SETUP
message) as the called party number. For example, if the device receives the below
INVITE, it sends "123" to the PSTN as the called party number and #456 as Keypad IE in
the INFORMATION message:
INVITE sip:%7B54443994-BDFF-413C-AE4F-
D039B0FFB134%7D@192.168.100.214:5064;transport=tcp;rinstance=9f25c
4452eff4acb SIP/2.0
To: sip:123#456@192.168.100.214;user=phone;x-type=unknown;x-
plan=unknown;x-pres=allowed
The destination number can be manipulated when this feature is enabled. Note that if
manipulation before routing is required, the * and # characters should not be used, as the
device will handle them according to the above keypad protocol. For example, a
manipulation rule should not be configured to add #456 to the destination number. If
manipulation after routing is required, the destination number to be manipulated will not
include the keypad part. For example, if you configure a manipulation rule to add the suffix
888 and the received INVITE contains the number 123#456, only 123 is manipulated and
the number dialed toward the PSTN is 123888; #456 is sent as keypad.
To enable this feature, use the ISDNKeypadMode parameter.
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