ZyXEL Communications ZYWALL 70 - V4.04 Podręcznik Użytkownika Pobierz pdf (Strona 107)

Figure 2.

(2) Try not use different global IPs for SIP client and SIP server on NAT.

Currently, there are still some limitations when use different global IPs for SIP client and

SIP server. For instance, in Figure 3, SIP server and a SIP client B are on the same LAN.

If we use different global IP for SIP server and the SIP client, the SIP client A which is

behind another NAT router will fail to communication with SIP client B.

Figure 3.

(3) We do not support that SIP client sends ACK directly to a peer client.

For instance, in Figure 4, when SIP phone A want to send ACK request direct to SIP

phone B, because of the limitation, this ACK request will not successfully transmit to SIP

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ZyXEL Communications ZYWALL 70 - V4.04 Podręcznik Użytkownika Strona 107