Sip Call Flow - 3Com VCX v7111 User Manual

In the following example, the IP address of the first gateway is 10.2.37.10 and its endpoint
numbers are 101 to 108. The IP address of the second gateway is 10.2.37.20 and its
endpoint numbers are 201 to 208.
In this example, a SIP Proxy is not used. Internal call routing is performed using the internal
Tel to IP Routing table.
To configure the two gateways:
For the first V7111 gateway (10.2.37.10), in the Endpoint Phone Numbers screen, assign
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the phone numbers 101 to 108 for the gateways endpoints.
For the second V7111 gateway (10.2.37.20), in the Endpoint Phone Numbers screen,
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assign the phone numbers 201 to 208 for the gateways endpoints.
Configure the following settings for both gateways:
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In the Tel to IP Routing screen, in the first row, enter 10 in the Destination Phone Prefix
field and enter the IP address of the first gateway (10.2.37.10) in the field IP Address. In
the second row, enter 20 and the IP address of the second gateway (10.2.37.20)
respectively. These settings enable the routing (from both gateways) of outgoing Tel IP
calls that start with 10 to the first gateway and calls that start with 20 to the second
gateway.
Make a call. Pick up the phone connected to port #1 of the first V7111 gateway and dial
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102 (to the phone connected to port #2 of the same gateway). Listen out for progress
tones at the calling endpoint and for ringing tone at the called endpoint. Answer the
called endpoint, speak into the calling endpoint, and check the voice quality. Dial 201
from the phone connected to port #1 of the first V7111 gateway; the phone connected to
port #1 of the second V7111 rings. Answer the call and check the voice quality.

SIP Call Flow

The following Call Flow describes SIP messages exchanged between two V7111 gateways
during simple call.
Telephone 6000 dials 2000, sending INVITE message to Gateway 10.8.201.161
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3Com VCX V7111 VoIP Gateway User Guide