Web Interface
74
41-001516-00 REV00 – 06.2013
Allow strict routing
By default, proxies specified on the SIP Registration page will be configured as loose-routing proxies. The loose-routing
designation (“;lr”) will be automatically appended to each proxy address when the proxy is added to the SIP Route
header. Older proxies may be strict-routing (see IETF RFC 2543), not supporting loose routing (see IETF RFC 3261). Ena-
ble this option if you are using strict-routing proxies. If this option is enabled and you are specifying one or more loose-
routing proxies in the SIP Registration page’s Outbound Proxy field, then you must manually add the “;lr” suffix to each
loose-routing proxy address. For example, “10.134.123.101;lr”.
Minimize SIP message size
The SIP protocol specifies that header field names can be in the full name form or in the abbreviated form. Abbreviated
form is useful when messages might be too large to be carried on the available transport, for example when exceeding
UDP’s Maximum Transmission Unit (MTU). Enable this option to encode SIP headers in their short forms to reduce size.
By default, the option is not enabled and SIP headers in outgoing messages will be encoded in their full names. (See SIP
protocol standard, IETF RFC 3261).
DTMF signaling method
Select the signaling method for transmitting DTFM tones, either via RTP (RFC2833) or SIP INFO messages. The default
is RTP.
Media on-hold method
The Media on hold method setting allows switching the Media on Hold behavior between the different RFC definitions.
“M line only (RFC3264)” implements the functionality according to RFC3264. In the INVITE message SDP body, the
attribute “a=sendonly” is set to a designated media stream to put media on-hold.
“M and C line (RFC2543)” implements the functionality according to RFC2543. In the INVITE message SDP body, the
connection line ip is set to “0.0.0.0” (e.g. “c= IN IP4 0.0.0.0”), and the attribute “a=inactive” is added.
SIP Settings