I have cisco 2651 with one L3 interface ip 172.26.18.200. This Cisco is gateway from E1 PRI (PBX Aastra MX-ONE TSW) to SIP (Asterisk). This cisco 2651 connected to cisco 2950 in port Fa 0/12. Fa 0/12 is in VLAN 518 (dot1q).
On cisco 2950 i made next commands:
# monitor session 1 source interface Fa 0/12 both encap dot1q
# monitor session 1 destination interface Fa 0/9
#sho monitor session 1
Type : Local Session
Source Ports :
Both : Fa0/12
Destination Ports : Fa0/9
Encapsulation : DOT1Q
I connected my notebook with Wireshark to cisco 2950 in Fa 0/9. Next, I made call from my PBX to Asterisk via cisco 2651. Call was
successful, but i didn't see any SIP call in wireshark. And I didn't see any frames with IP addresses Cisco 2651 (172.26.18.200) or Asterisk. Why wireshark doesn't capture this traffic?
I found the problem. Cisco 2651 send voice-traffic back to the voice serial port via E1 PRi to PBX. Therefore I can't to see any voip traffic in wireshark. Topic is closed. Thx.