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SIP Ip phones unable to call on SRST mode

We got a CUCM ver 10.0.1.10000-24.

Our client has about 170 Ip Phones user on one remote site.

We have configured SRST ont that site, here you have router's configuration ( related to SRST):

voice service voip
 ip address trusted list
  ipv4 10.11.67.11
  ipv4 10.32.1.31
  ipv4 10.32.1.90
  ipv4 10.16.5.0
  ipv4 10.16.5.0 255.255.255.0
 no ip address trusted authenticate
 allow-connections h323 to h323
 allow-connections h323 to sip
 allow-connections sip to h323
 allow-connections sip to sip
 no supplementary-service sip moved-temporarily
 no supplementary-service sip refer
 fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
 h323
 sip
  bind control source-interface GigabitEthernet0/2
  bind media source-interface GigabitEthernet0/2
  min-se 90 session-expires 90
  header-passing
  error-passthru
  registrar server
  early-offer forced
  midcall-signaling passthru
!
!
voice register global
 system message SRST Mode
 max-dn 150
 max-pool 58
!
voice register pool  1
 id network 10.16.5.0 mask 255.255.255.0
 no digit collect kpml
 dtmf-relay rtp-nte cisco-rtp sip-notify
 codec g711ulaw
 no vad
!

During tests about 60 Ip Iphones got registration with proper Directory Numbers. But when we try to with internals call from any DN, we got:

a) Calling Ip Phone: rings ONE time and call falls on reorder tone.

b) Called Ip Phone: keeps ringing..

And when we call from PSTN to internal pilot, the calls fall too and internal Ip Phone keeps ringing.

IMPORTANT tip: Ip phone's network 10.16.5.0/24 is not directly connected to our SRST voice gateway, but we have full access between this network and the voice gateway..

  • Do you know what is missing on our voice gateway configuration?
  • Do you know how I can set up a specific group of Ip Phones to get this registration 50 over 170?

Best regards

 

 

 

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