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Advanced Configuration
► Echo Canceler
The Echo Canceler can in certain situations reduce echo. More on the topic of echo can be found under
„Appendix A: Echo Canceling“ on page ii.
►
Early Media
Early Media activates the connect through of the voice channel before the connection is completely estab -
lished in order to make dialing tones and messages audible. Should be activated.
► Early Progress
Is Early Progress activated, outbound calls coming from Lync will via a PROGRESS message with SDP in
all cases establish an internal voice connection (RTP) before the call is passed over to the ISDN. Improves
the behavior of Early Media in order to prevent clipping. Should be activated.
► Always RTP On Ringing
Establishes the RTP connection even when no in-band information is signaled in ISDN.
► PRACK
Via this element, the confirmation of provisional messages can be activated. Has to be set to „supported“ /
“required“ in combination with Microsoft counterparts.
► SRTP
Controls voice encryption (disabled, supported, required). Should be set to „supported“. In that case the
encryption is used in cases that the counterpart supports it as well.
► ‘phone-context’ in INVITE FROM/TO
The SIP-Header of an INVITE contains in FROM respectively TO a phone context with the here entered
information. The entry user in the description field results in the SIP-Header in the appendix phone-contex -
t=user. Not commonly used.
► Send ‘user=phone’ in FROM/TO
User=phone is included in the INVITE of SIP-URIs when this box is checked.
► Do not send Alert
Is this option activated, no SIP ALERT messages are send.
► Send only one Alert
Only sends ALERTING once into ISDN even if SIP recognizes RINGING multiple times.
► Do not send ISDN progress
For inbound calls Lync receives a PROGRESS message while a connection is established, which then re -
sults in a PROGRESS message in ISDN. Some PBXs react to this with an error - in those cases this option
should be activated.