Bandwidth requirement for Branch for IP Phone deployment

[Suchi]

Hi Guys,

I need to deploy about 25 IP phones in branch with SRST & what is the recommended bandwidth in between HQ & Branch ? CUCM servers in HQ & Branch connected with 4M link (Copper) & users already having issues with Terminal session connectivity over the WAN.

Please advice.

Regards

Suchi

[Mohammed al Baqari · Accepted solution]

Hi,

SRND is your way will all details. It all depends on what services you are provisioning to the users. See the link below.

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/models.html

For call control, SRND provide best practice and formulas for bandwidth. See below table and link.

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab10/collab10/netstruc.html

Table 3-9 Recommended Layer 3 Bandwidth for Call Control Traffic With and Without Signaling Encryption

Branch Office Size (Number of IP Phones and Gateways)	Recommended Bandwidth for SCCP Control Traffic (no encryption)	Recommended Bandwidth for SCCP Control Traffic (with encryption)	Recommended Bandwidth for SIP Control Traffic (no encryption)	Recommended Bandwidth for SIP Control Traffic (with encryption)
1 to 10	8 kbps	8 kbps	8 kbps	8 kbps
20	8 kbps	9 kbps	11 kbps	12 kbps
30	8 kbps	13 kbps	16 kbps	19 kbps
40	11 kbps	17 kbps	22 kbps	25 kbps
50	14 kbps	21 kbps	27 kbps	31 kbps
100	27 kbps	42 kbps	54 kbps	62 kbps
150	40 kbps	62 kbps	81 kbps	93 kbps

[carlos.perez1]

I have the same question or nose if it is similar or different
I would like to know how much bandwidth is consumed, only when the phone is registered, without making any calls, just registered, what happens is that we will place a centralized solution and we need to size QoS with the SP to guarantee good voice communication through the WAN, in a remote location I will have 140 telephones and I need to know how much BW needed separates for the voice QoS,
There is documentation of how much you consume per call according to the codec, but you can not find any document of how much a Cisco phone consumes just because it is registered to the Call Manager (this is for remote sites that go through a wan)

Any comments will be welcome.

Regards
Carlos P.