3.1.7. Restrictions 
For all variants of OpenScape 4000 SoftGate:
- For signaling survivability no other ISDN modems as released for OpenScape 4000 will be supported.
- Analogue modem connectivity is not supported.
- Codec G.723 is not supported.
- The following restrictions apply when connecting to CO over Mediatrix
gateways:
- Accounting is not supported.
- Callback functionality not supported.
- A maximum number of 83 OpenScape 4000 SoftGates 50/1000 or IP Access Points can be connected to one OpenScape 4000 system.
- Limitations to DMC (see “Payload Switching DMC”, Chapter
4, “Direct Media Connect (DMC) in Connection with OpenScape 4000 SoftGate”):
- End-to-end payload can also be achieved to a native SIP trunk (depending on the trunk profile).
- The MediaCapabilities (e.g. codecs) can be renegotiated/changed between the SIP partners (on the OpenScape 4000 SoftGate) even after the DMC connection has been established.
- If a SIP device or a SIP native trunk on the 4000 SoftGate communicates with an DMC endpoint (not the DMC proxy!), then a MediaRelay is activated between them on the OpenScape 4000 SoftGate. This corresponds to an RTP proxy which always routes the media stream (RTP) via the OpenScape 4000 SoftGate.
- If a SIP device or SIP native trunk on the OpenScape 4000 SoftGate communicates with a DMC proxy on the common gateway, then the MediaCapabilities are passed on transparent and an E2E payload connection is established. However due to the restrictions of the DMC proxies on the CGW, it is not possible to renegotiate codecs.
For OpenScape 4000 SoftGate 50 only:
- Provider access requires OpenScape Access modules or direct SIP provider connections.
For OpenScape 4000 SoftGate 1000 only:
- Signaling Survivability via PSTN network is not supported for OpenScape 4000 SoftGate 1000.
- Provider access requires AP 3700 IP or direct SIP provider connections.
For Integrated SoftGate on Enterprise Gateway:
- XLink is not supported
- date, time and timezone are the same as the Enterprise Gateway on which the Integrated SoftGate is running
- Signaling Survivability via PSTN network is not supported
- iSG must be have the same connection type as the EntGW/SurvEntGW (AMO-UCSU: CONNTYPE =APNW/APDL)